21371025888 has 72 divisors (see below), whose sum is σ = 61161078888. Its totient is φ = 7078286592.

The previous prime is 21371025877. The next prime is 21371025911. The reversal of 21371025888 is 88852017312.

21371025888 is a `hidden beast` number, since 21 + 37 + 10 + 2 + 588 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 191106 + ... + 281537.

It is an arithmetic number, because the mean of its divisors is an integer number (849459429).

Almost surely, 2^21371025888 is an apocalyptic number.

It is an amenable number.

21371025888 is an abundant number, since it is smaller than the sum of its proper divisors (39790053000).

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

21371025888 is a wasteful number, since it uses less digits than its factorization.

21371025888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472816 (or 472805 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 21371025888 in words is "twenty-one billion, three hundred seventy-one million, twenty-five thousand, eight hundred eighty-eight".