22121021012100 has 72 divisors (see below), whose sum is σ = 64590675515520. Its totient is φ = 5844820222080.

The previous prime is 22121021012071. The next prime is 22121021012131. The reversal of 22121021012100 is 121012012122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 22121021012100.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 338209212 + ... + 338274611.

Almost surely, 2^{22121021012100} is an apocalyptic number.

22121021012100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121021012100 is an abundant number, since it is smaller than the sum of its proper divisors (42469654503420).

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

22121021012100 is a wasteful number, since it uses less digits than its factorization.

22121021012100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676483949 (or 676483942 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 22121021012100 its reverse (121012012122), we get a palindrome (22242033024222).

The spelling of 22121021012100 in words is "twenty-two trillion, one hundred twenty-one billion, twenty-one million, twelve thousand, one hundred".