21992608 has 48 divisors (see below), whose sum is σ = 48365856. Its totient is φ = 9757440.

The previous prime is 21992599. The next prime is 21992617. The reversal of 21992608 is 80629912.

It is an interprime number because it is at equal distance from previous prime (21992599) and next prime (21992617).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14410 + ... + 15862.

It is an arithmetic number, because the mean of its divisors is an integer number (1007622).

Almost surely, 2^21992608 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 21992608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24182928).

21992608 is an abundant number, since it is smaller than the sum of its proper divisors (26373248).

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

21992608 is a wasteful number, since it uses less digits than its factorization.

21992608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517 (or 1509 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 21992608 is about 4689.6277037735. The cubic root of 21992608 is about 280.1725467095.

The spelling of 21992608 in words is "twenty-one million, nine hundred ninety-two thousand, six hundred eight".