21152455232 has 84 divisors (see below), whose sum is σ = 43756545456. Its totient is φ = 10144673280.

The previous prime is 21152455231. The next prime is 21152455273. The reversal of 21152455232 is 23255425112.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (21152455231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8772107 + ... + 8774517.

Almost surely, 2^21152455232 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 21152455232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21878272728).

21152455232 is an abundant number, since it is smaller than the sum of its proper divisors (22604090224).

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

21152455232 is a wasteful number, since it uses less digits than its factorization.

21152455232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644 (or 2605 counting only the distinct ones).

The product of its digits is 24000, while the sum is 32.

The spelling of 21152455232 in words is "twenty-one billion, one hundred fifty-two million, four hundred fifty-five thousand, two hundred thirty-two".