21221222022120 has 64 divisors (see below), whose sum is σ = 63667990189440. Its totient is φ = 5658608172800.

The previous prime is 21221222022113. The next prime is 21221222022137. The reversal of 21221222022120 is 2122022212212.

It is a super-2 number, since 2×21221222022120² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4229436 + ... + 7767275.

It is an arithmetic number, because the mean of its divisors is an integer number (994812346710).

Almost surely, 2^{21221222022120} is an apocalyptic number.

21221222022120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221222022120 is an abundant number, since it is smaller than the sum of its proper divisors (42446768167320).

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

21221222022120 is a wasteful number, since it uses less digits than its factorization.

21221222022120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12011466 (or 12011462 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21221222022120 its reverse (2122022212212), we get a palindrome (23343244234332).

The spelling of 21221222022120 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, twenty-two thousand, one hundred twenty".