21633276577820 has 24 divisors (see below), whose sum is σ = 45469282319664. Its totient is φ = 8645805582336.

The previous prime is 21633276577807. The next prime is 21633276577889. The reversal of 21633276577820 is 2877567233612.

It is a self number, because there is not a number n which added to its sum of digits gives 21633276577820.

It is a congruent number.

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, 469041914 + ... + 469088033.

It is an arithmetic number, because the mean of its divisors is an integer number (1894553429986).

Almost surely, 2^{21633276577820} is an apocalyptic number.

21633276577820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21633276577820 is an abundant number, since it is smaller than the sum of its proper divisors (23836005741844).

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

21633276577820 is a wasteful number, since it uses less digits than its factorization.

21633276577820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938131109 (or 938131107 counting only the distinct ones).

The product of its (nonzero) digits is 35562240, while the sum is 59.

The spelling of 21633276577820 in words is "twenty-one trillion, six hundred thirty-three billion, two hundred seventy-six million, five hundred seventy-seven thousand, eight hundred twenty".