202121101202220 has 144 divisors (see below), whose sum is σ = 615198224571840. Its totient is φ = 53714637969408.

The previous prime is 202121101202159. The next prime is 202121101202249. The reversal of 202121101202220 is 22202101121202.

It is a happy number.

202121101202220 is a `hidden beast` number, since 2 + 0 + 212 + 110 + 120 + 2 + 220 = 666.

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 = 202121101202193 and 202121101202202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 250704921 + ... + 251509839.

It is an arithmetic number, because the mean of its divisors is an integer number (4272209892860).

Almost surely, 2^{202121101202220} is an apocalyptic number.

202121101202220 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 202121101202220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307599112285920).

202121101202220 is an abundant number, since it is smaller than the sum of its proper divisors (413077123369620).

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

202121101202220 is a wasteful number, since it uses less digits than its factorization.

202121101202220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809704 (or 809699 counting only the distinct ones).

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

Adding to 202121101202220 its reverse (22202101121202), we get a palindrome (224323202323422).

The spelling of 202121101202220 in words is "two hundred two trillion, one hundred twenty-one billion, one hundred one million, two hundred two thousand, two hundred twenty".