21154624650 has 36 divisors (see below), whose sum is σ = 56835426102. Its totient is φ = 5641233120.

The previous prime is 21154624649. The next prime is 21154624691. The reversal of 21154624650 is 5642645112.

21154624650 is a `hidden beast` number, since 21 + 1 + 5 + 4 + 624 + 6 + 5 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 13429796769 + 7724827881 = 115887^2 + 87891^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23504689 + ... + 23505588.

Almost surely, 2^21154624650 is an apocalyptic number.

21154624650 is an abundant number, since it is smaller than the sum of its proper divisors (35680801452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21154624650 is a wasteful number, since it uses less digits than its factorization.

21154624650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47010295 (or 47010287 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

It can be divided in two parts, 211546 and 24650, that added together give a square (236196 = 486²).

The spelling of 21154624650 in words is "twenty-one billion, one hundred fifty-four million, six hundred twenty-four thousand, six hundred fifty".