21827906625 has 32 divisors (see below), whose sum is σ = 41510446848. Its totient is φ = 9978470400.

The previous prime is 21827906603. The next prime is 21827906669. The reversal of 21827906625 is 52660972812.

It is not a de Polignac number, because 21827906625 - 2¹⁰ = 21827905601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4155072 + ... + 4160321.

It is an arithmetic number, because the mean of its divisors is an integer number (1297201464).

Almost surely, 2^21827906625 is an apocalyptic number.

21827906625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21827906625 is a deficient number, since it is larger than the sum of its proper divisors (19682540223).

21827906625 is an equidigital number, since it uses as much as digits as its factorization.

21827906625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8315418 (or 8315408 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 21827906625 in words is "twenty-one billion, eight hundred twenty-seven million, nine hundred six thousand, six hundred twenty-five".