21625390124986 has 16 divisors (see below), whose sum is σ = 35274483735336. Its totient is φ = 9901609468416.

The previous prime is 21625390124981. The next prime is 21625390125029. The reversal of 21625390124986 is 68942109352612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21314555999361 + 310834125625 = 4616769^2 + 557525^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21625390124986.

It is not an unprimeable number, because it can be changed into a prime (21625390124981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8595145851 + ... + 8595148366.

Almost surely, 2^{21625390124986} is an apocalyptic number.

21625390124986 is a deficient number, since it is larger than the sum of its proper divisors (13649093610350).

21625390124986 is a wasteful number, since it uses less digits than its factorization.

21625390124986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17190294273.

The product of its (nonzero) digits is 11197440, while the sum is 58.

The spelling of 21625390124986 in words is "twenty-one trillion, six hundred twenty-five billion, three hundred ninety million, one hundred twenty-four thousand, nine hundred eighty-six".