21532392 has 160 divisors (see below), whose sum is σ = 71089920. Its totient is φ = 5961600.

The previous prime is 21532373. The next prime is 21532403. The reversal of 21532392 is 29323512.

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

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 39 ways as a sum of consecutive naturals, for example, 213142 + ... + 213242.

It is an arithmetic number, because the mean of its divisors is an integer number (444312).

Almost surely, 2^21532392 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 21532392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35544960).

21532392 is an abundant number, since it is smaller than the sum of its proper divisors (49557528).

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

21532392 is a wasteful number, since it uses less digits than its factorization.

21532392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 160 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 21532392 is about 4640.3008523155. The cubic root of 21532392 is about 278.2044628730.

The spelling of 21532392 in words is "twenty-one million, five hundred thirty-two thousand, three hundred ninety-two".