21601431088 has 40 divisors (see below), whose sum is σ = 43761770496. Its totient is φ = 10309992000.

The previous prime is 21601431053. The next prime is 21601431107. The reversal of 21601431088 is 88013410612.

It is a super-2 number, since 2×21601431088² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120913 + ... + 240463.

Almost surely, 2^21601431088 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21601431088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21880885248).

21601431088 is an abundant number, since it is smaller than the sum of its proper divisors (22160339408).

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

21601431088 is a wasteful number, since it uses less digits than its factorization.

21601431088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120073 (or 120067 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 21601431088 in words is "twenty-one billion, six hundred one million, four hundred thirty-one thousand, eighty-eight".