21150566607625 has 64 divisors (see below), whose sum is σ = 33019849594368. Its totient is φ = 13168141920000.

The previous prime is 21150566607593. The next prime is 21150566607641. The reversal of 21150566607625 is 52670666505112.

It is not a de Polignac number, because 21150566607625 - 2⁵ = 21150566607593 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14547031 + ... + 15934780.

It is an arithmetic number, because the mean of its divisors is an integer number (515935149912).

Almost surely, 2^{21150566607625} is an apocalyptic number.

21150566607625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21150566607625 is a deficient number, since it is larger than the sum of its proper divisors (11869282986743).

21150566607625 is a wasteful number, since it uses less digits than its factorization.

21150566607625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30481907 (or 30481897 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 52.

The spelling of 21150566607625 in words is "twenty-one trillion, one hundred fifty billion, five hundred sixty-six million, six hundred seven thousand, six hundred twenty-five".