222121002202220 has 96 divisors (see below), whose sum is σ = 520210240413696. Its totient is φ = 78972961478400.

The previous prime is 222121002202217. The next prime is 222121002202241. The reversal of 222121002202220 is 22202200121222.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 222121002202192 and 222121002202201.

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 31 ways as a sum of consecutive naturals, for example, 591467 + ... + 21085346.

It is an arithmetic number, because the mean of its divisors is an integer number (5418856670976).

Almost surely, 2^{222121002202220} is an apocalyptic number.

222121002202220 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 222121002202220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260105120206848).

222121002202220 is an abundant number, since it is smaller than the sum of its proper divisors (298089238211476).

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

222121002202220 is a wasteful number, since it uses less digits than its factorization.

222121002202220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21677871 (or 21677869 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 222121002202220 its reverse (22202200121222), we get a palindrome (244323202323442).

It can be divided in two parts, 222121002 and 202220, that added together give a palindrome (222323222).

The spelling of 222121002202220 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, two million, two hundred two thousand, two hundred twenty".