21122993996 has 24 divisors (see below), whose sum is σ = 39817266720. Its totient is φ = 9746980992.

The previous prime is 21122993977. The next prime is 21122994007. The reversal of 21122993996 is 69939922112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215585 + ... + 297863.

It is an arithmetic number, because the mean of its divisors is an integer number (1659052780).

Almost surely, 2^21122993996 is an apocalyptic number.

21122993996 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21122993996 is a deficient number, since it is larger than the sum of its proper divisors (18694272724).

21122993996 is a wasteful number, since it uses less digits than its factorization.

21122993996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87233 (or 87231 counting only the distinct ones).

The product of its digits is 944784, while the sum is 53.

The spelling of 21122993996 in words is "twenty-one billion, one hundred twenty-two million, nine hundred ninety-three thousand, nine hundred ninety-six".