21167625552 has 20 divisors (see below), whose sum is σ = 54683032800. Its totient is φ = 7055875168.

The previous prime is 21167625487. The next prime is 21167625553. The reversal of 21167625552 is 25552676112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21167625553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220496052 + ... + 220496147.

It is an arithmetic number, because the mean of its divisors is an integer number (2734151640).

Almost surely, 2^21167625552 is an apocalyptic number.

It is an amenable number.

21167625552 is an abundant number, since it is smaller than the sum of its proper divisors (33515407248).

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

21167625552 is a wasteful number, since it uses less digits than its factorization.

21167625552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440992210 (or 440992204 counting only the distinct ones).

The product of its digits is 252000, while the sum is 42.

The spelling of 21167625552 in words is "twenty-one billion, one hundred sixty-seven million, six hundred twenty-five thousand, five hundred fifty-two".