21057635325 has 12 divisors (see below), whose sum is σ = 34815290528. Its totient is φ = 11230738800.

The previous prime is 21057635317. The next prime is 21057635341. The reversal of 21057635325 is 52353675012.

It is not a de Polignac number, because 21057635325 - 2³ = 21057635317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140384161 + ... + 140384310.

Almost surely, 2^21057635325 is an apocalyptic number.

21057635325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21057635325 is a deficient number, since it is larger than the sum of its proper divisors (13757655203).

21057635325 is a wasteful number, since it uses less digits than its factorization.

21057635325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280768484 (or 280768479 counting only the distinct ones).

The product of its (nonzero) digits is 189000, while the sum is 39.

The spelling of 21057635325 in words is "twenty-one billion, fifty-seven million, six hundred thirty-five thousand, three hundred twenty-five".