21658500124 has 12 divisors (see below), whose sum is σ = 38250104200. Its totient is φ = 10729898928.

The previous prime is 21658500047. The next prime is 21658500161. The reversal of 21658500124 is 42100585612.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21658500124.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24837294 + ... + 24838165.

Almost surely, 2^21658500124 is an apocalyptic number.

It is an amenable number.

21658500124 is a deficient number, since it is larger than the sum of its proper divisors (16591604076).

21658500124 is a wasteful number, since it uses less digits than its factorization.

21658500124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49675572 (or 49675570 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The spelling of 21658500124 in words is "twenty-one billion, six hundred fifty-eight million, five hundred thousand, one hundred twenty-four".