21902563250 has 32 divisors (see below), whose sum is σ = 41049843120. Its totient is φ = 8750716800.

The previous prime is 21902563231. The next prime is 21902563259. The reversal of 21902563250 is 5236520912.

It can be written as a sum of positive squares in 8 ways, for example, as 4916393689 + 16986169561 = 70117^2 + 130331^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21902563250.

It is not an unprimeable number, because it can be changed into a prime (21902563259) 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, 163136 + ... + 265364.

Almost surely, 2^21902563250 is an apocalyptic number.

21902563250 is a deficient number, since it is larger than the sum of its proper divisors (19147279870).

21902563250 is a wasteful number, since it uses less digits than its factorization.

21902563250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103103 (or 103093 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 21902563250 in words is "twenty-one billion, nine hundred two million, five hundred sixty-three thousand, two hundred fifty".