21366451250 has 20 divisors (see below), whose sum is σ = 40049278566. Its totient is φ = 8546580000.

The previous prime is 21366451247. The next prime is 21366451261. The reversal of 21366451250 is 5215466312.

It can be written as a sum of positive squares in 5 ways, for example, as 928603729 + 20437847521 = 30473^2 + 142961^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21366451250.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 8545331 + ... + 8547830.

Almost surely, 2^21366451250 is an apocalyptic number.

21366451250 is a deficient number, since it is larger than the sum of its proper divisors (18682827316).

21366451250 is an equidigital number, since it uses as much as digits as its factorization.

21366451250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17093183 (or 17093168 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 21366451250 in words is "twenty-one billion, three hundred sixty-six million, four hundred fifty-one thousand, two hundred fifty".