21057298968 has 32 divisors (see below), whose sum is σ = 52916022000. Its totient is φ = 6982729728.

The previous prime is 21057298957. The next prime is 21057298987. The reversal of 21057298968 is 86989275012.

It is a happy number.

It is a congruent 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, 2268393 + ... + 2277656.

Almost surely, 2^21057298968 is an apocalyptic number.

It is an amenable number.

21057298968 is an abundant number, since it is smaller than the sum of its proper divisors (31858723032).

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

21057298968 is a wasteful number, since it uses less digits than its factorization.

21057298968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4546251 (or 4546247 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 57.

The spelling of 21057298968 in words is "twenty-one billion, fifty-seven million, two hundred ninety-eight thousand, nine hundred sixty-eight".