21086162751 has 16 divisors (see below), whose sum is σ = 28597000320. Its totient is φ = 13816476960.

The previous prime is 21086162729. The next prime is 21086162761. The reversal of 21086162751 is 15726168012.

It is not a de Polignac number, because 21086162751 - 2⁵ = 21086162719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21086162701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1332556 + ... + 1348286.

It is an arithmetic number, because the mean of its divisors is an integer number (1787312520).

Almost surely, 2^21086162751 is an apocalyptic number.

21086162751 is a deficient number, since it is larger than the sum of its proper divisors (7510837569).

21086162751 is a wasteful number, since it uses less digits than its factorization.

21086162751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23366.

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 21086162751 in words is "twenty-one billion, eighty-six million, one hundred sixty-two thousand, seven hundred fifty-one".