21652988454 has 24 divisors (see below), whose sum is σ = 47912997600. Its totient is φ = 7064095248.

The previous prime is 21652988437. The next prime is 21652988477. The reversal of 21652988454 is 45488925612.

21652988454 is a `hidden beast` number, since 2 + 165 + 29 + 8 + 8 + 454 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21652988454.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12796429 + ... + 12798120.

It is an arithmetic number, because the mean of its divisors is an integer number (1996374900).

Almost surely, 2^21652988454 is an apocalyptic number.

21652988454 is an abundant number, since it is smaller than the sum of its proper divisors (26260009146).

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

21652988454 is a wasteful number, since it uses less digits than its factorization.

21652988454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25594604 (or 25594601 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 54.

The spelling of 21652988454 in words is "twenty-one billion, six hundred fifty-two million, nine hundred eighty-eight thousand, four hundred fifty-four".