21715024455 has 16 divisors (see below), whose sum is σ = 38604488160. Its totient is φ = 11581346304.

The previous prime is 21715024453. The next prime is 21715024489. The reversal of 21715024455 is 55442051712.

21715024455 is a `hidden beast` number, since 217 + 150 + 244 + 55 = 666.

It is not a de Polignac number, because 21715024455 - 2¹ = 21715024453 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21715024453) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 80425882 + ... + 80426151.

It is an arithmetic number, because the mean of its divisors is an integer number (2412780510).

Almost surely, 2^21715024455 is an apocalyptic number.

21715024455 is a deficient number, since it is larger than the sum of its proper divisors (16889463705).

21715024455 is a wasteful number, since it uses less digits than its factorization.

21715024455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160852047 (or 160852041 counting only the distinct ones).

The product of its (nonzero) digits is 56000, while the sum is 36.

The spelling of 21715024455 in words is "twenty-one billion, seven hundred fifteen million, twenty-four thousand, four hundred fifty-five".