21913227504 has 120 divisors (see below), whose sum is σ = 71981925600. Its totient is φ = 6091697664.

The previous prime is 21913227493. The next prime is 21913227521. The reversal of 21913227504 is 40572231912.

21913227504 is a `hidden beast` number, since 2 + 19 + 132 + 2 + 7 + 504 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 256479 + ... + 331070.

It is an arithmetic number, because the mean of its divisors is an integer number (599849380).

Almost surely, 2^21913227504 is an apocalyptic number.

21913227504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21913227504 is an abundant number, since it is smaller than the sum of its proper divisors (50068698096).

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

21913227504 is a wasteful number, since it uses less digits than its factorization.

21913227504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587607 (or 587598 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 21913227504 in words is "twenty-one billion, nine hundred thirteen million, two hundred twenty-seven thousand, five hundred four".