202220111021220 has 144 divisors (see below), whose sum is σ = 621983556924912. Its totient is φ = 53171279953920.

The previous prime is 202220111021189. The next prime is 202220111021251. The reversal of 202220111021220 is 22120111022202.

It is a happy number.

202220111021220 is a `hidden beast` number, since 202 + 220 + 1 + 1 + 1 + 0 + 21 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (202220111021189) and next prime (202220111021251).

It can be written as a sum of positive squares in 8 ways, for example, as 30078731110464 + 172141379910756 = 5484408^2 + 13120266^2 .

It is a super-2 number, since 2×202220111021220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 202220111021193 and 202220111021202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 43254244 + ... + 47700836.

It is an arithmetic number, because the mean of its divisors is an integer number (4319330256423).

Almost surely, 2^{202220111021220} is an apocalyptic number.

202220111021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 202220111021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310991778462456).

202220111021220 is an abundant number, since it is smaller than the sum of its proper divisors (419763445903692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

202220111021220 is a wasteful number, since it uses less digits than its factorization.

202220111021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4450142 (or 4450137 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 202220111021220 its reverse (22120111022202), we get a palindrome (224340222043422).

The spelling of 202220111021220 in words is "two hundred two trillion, two hundred twenty billion, one hundred eleven million, twenty-one thousand, two hundred twenty".