21902832 has 80 divisors (see below), whose sum is σ = 71860480. Its totient is φ = 6257088.

The previous prime is 21902827. The next prime is 21902849. The reversal of 21902832 is 23820912.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21902796 and 21902805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 598 + ... + 6645.

It is an arithmetic number, because the mean of its divisors is an integer number (898256).

Almost surely, 2^21902832 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 21902832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35930240).

21902832 is an abundant number, since it is smaller than the sum of its proper divisors (49957648).

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

21902832 is a wasteful number, since it uses less digits than its factorization.

21902832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7267 (or 7255 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 21902832 is about 4680.0461536186. The cubic root of 21902832 is about 279.7907961118.

The spelling of 21902832 in words is "twenty-one million, nine hundred two thousand, eight hundred thirty-two".