21652992 has 120 divisors (see below), whose sum is σ = 64686336. Its totient is φ = 6967296.

The previous prime is 21652963. The next prime is 21652997. The reversal of 21652992 is 29925612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21652997) 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, 170433 + ... + 170559.

Almost surely, 2^21652992 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 21652992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32343168).

21652992 is an abundant number, since it is smaller than the sum of its proper divisors (43033344).

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

21652992 is a wasteful number, since it uses less digits than its factorization.

21652992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 169 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 21652992 is about 4653.2775545845. The cubic root of 21652992 is about 278.7228913156.

The spelling of 21652992 in words is "twenty-one million, six hundred fifty-two thousand, nine hundred ninety-two".