21122012996 has 12 divisors (see below), whose sum is σ = 42244026048. Its totient is φ = 9052291272.

The previous prime is 21122012911. The next prime is 21122013007. The reversal of 21122012996 is 69921022112.

21122012996 is an admirable number.

It is a super-2 number, since 2×21122012996² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377178776 + ... + 377178831.

It is an arithmetic number, because the mean of its divisors is an integer number (3520335504).

Almost surely, 2^21122012996 is an apocalyptic number.

It is an amenable number.

21122012996 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21122012996 is a wasteful number, since it uses less digits than its factorization.

21122012996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754357618 (or 754357616 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 21122012996 in words is "twenty-one billion, one hundred twenty-two million, twelve thousand, nine hundred ninety-six".