21586725888 has 352 divisors, whose sum is σ = 72762891264. Its totient is φ = 5536677888.

The previous prime is 21586725871. The next prime is 21586725917. The reversal of 21586725888 is 88852768512.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10342381 + ... + 10344467.

Almost surely, 2^21586725888 is an apocalyptic number.

21586725888 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21586725888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36381445632).

21586725888 is an abundant number, since it is smaller than the sum of its proper divisors (51176165376).

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

21586725888 is a wasteful number, since it uses less digits than its factorization.

21586725888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2167 (or 2149 counting only the distinct ones).

The product of its digits is 17203200, while the sum is 60.

The spelling of 21586725888 in words is "twenty-one billion, five hundred eighty-six million, seven hundred twenty-five thousand, eight hundred eighty-eight".