21415502332 has 72 divisors (see below), whose sum is σ = 44233076160. Its totient is φ = 9044380800.

The previous prime is 21415502309. The next prime is 21415502341. The reversal of 21415502332 is 23320551412.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21415502332.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10853298 + ... + 10855270.

It is an arithmetic number, because the mean of its divisors is an integer number (614348280).

Almost surely, 2^21415502332 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 21415502332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22116538080).

21415502332 is an abundant number, since it is smaller than the sum of its proper divisors (22817573828).

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

21415502332 is a wasteful number, since it uses less digits than its factorization.

21415502332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2771 (or 2762 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 21415502332 in words is "twenty-one billion, four hundred fifteen million, five hundred two thousand, three hundred thirty-two".