21654533860 has 24 divisors (see below), whose sum is σ = 45504680256. Its totient is φ = 8656068960.

The previous prime is 21654533839. The next prime is 21654533903. The reversal of 21654533860 is 6833545612.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

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 7 ways as a sum of consecutive naturals, for example, 328062 + ... + 388501.

It is an arithmetic number, because the mean of its divisors is an integer number (1896028344).

Almost surely, 2^21654533860 is an apocalyptic number.

21654533860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21654533860 is an abundant number, since it is smaller than the sum of its proper divisors (23850146396).

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

21654533860 is a wasteful number, since it uses less digits than its factorization.

21654533860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718083 (or 718081 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 21654533860 in words is "twenty-one billion, six hundred fifty-four million, five hundred thirty-three thousand, eight hundred sixty".