21157923336 has 64 divisors (see below), whose sum is σ = 59564851200. Its totient is φ = 6204667200.

The previous prime is 21157923323. The next prime is 21157923349. The reversal of 21157923336 is 63332975112.

It is an interprime number because it is at equal distance from previous prime (21157923323) and next prime (21157923349).

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, 1284456 + ... + 1300823.

It is an arithmetic number, because the mean of its divisors is an integer number (930700800).

Almost surely, 2^21157923336 is an apocalyptic number.

It is an amenable number.

21157923336 is an abundant number, since it is smaller than the sum of its proper divisors (38406927864).

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

21157923336 is a wasteful number, since it uses less digits than its factorization.

21157923336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2585330 (or 2585326 counting only the distinct ones).

The product of its digits is 204120, while the sum is 42.

The spelling of 21157923336 in words is "twenty-one billion, one hundred fifty-seven million, nine hundred twenty-three thousand, three hundred thirty-six".