21125600985 has 16 divisors (see below), whose sum is σ = 34438716864. Its totient is φ = 11054402112.

The previous prime is 21125600939. The next prime is 21125601023. The reversal of 21125600985 is 58900652112.

It is not a de Polignac number, because 21125600985 - 2⁶ = 21125600921 is a prime.

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, 13285747 + ... + 13287336.

It is an arithmetic number, because the mean of its divisors is an integer number (2152419804).

Almost surely, 2^21125600985 is an apocalyptic number.

It is an amenable number.

21125600985 is a deficient number, since it is larger than the sum of its proper divisors (13313115879).

21125600985 is a wasteful number, since it uses less digits than its factorization.

21125600985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26573144.

The product of its (nonzero) digits is 43200, while the sum is 39.

The spelling of 21125600985 in words is "twenty-one billion, one hundred twenty-five million, six hundred thousand, nine hundred eighty-five".