21136670125 has 32 divisors (see below), whose sum is σ = 26619989760. Its totient is φ = 16755076800.

The previous prime is 21136670119. The next prime is 21136670147. The reversal of 21136670125 is 52107663112.

It is not a de Polignac number, because 21136670125 - 2²¹ = 21134572973 is a prime.

It is a congruent number.

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, 13152072 + ... + 13153678.

It is an arithmetic number, because the mean of its divisors is an integer number (831874680).

Almost surely, 2^21136670125 is an apocalyptic number.

21136670125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21136670125 is a deficient number, since it is larger than the sum of its proper divisors (5483319635).

21136670125 is a wasteful number, since it uses less digits than its factorization.

21136670125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2518 (or 2508 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 21136670125 in words is "twenty-one billion, one hundred thirty-six million, six hundred seventy thousand, one hundred twenty-five".