21425576544 has 96 divisors (see below), whose sum is σ = 66167267040. Its totient is φ = 6721744896.

The previous prime is 21425576483. The next prime is 21425576581. The reversal of 21425576544 is 44567552412.

21425576544 is a `hidden beast` number, since 2 + 1 + 4 + 25 + 576 + 54 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 21425576544.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 714669 + ... + 744044.

It is an arithmetic number, because the mean of its divisors is an integer number (689242365).

Almost surely, 2^21425576544 is an apocalyptic number.

21425576544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21425576544 is an abundant number, since it is smaller than the sum of its proper divisors (44741690496).

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

21425576544 is a wasteful number, since it uses less digits than its factorization.

21425576544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458749 (or 1458735 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 45.

The spelling of 21425576544 in words is "twenty-one billion, four hundred twenty-five million, five hundred seventy-six thousand, five hundred forty-four".