21988832 has 12 divisors (see below), whose sum is σ = 43290576. Its totient is φ = 10994400.

The previous prime is 21988829. The next prime is 21988847. The reversal of 21988832 is 23888912.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21988832.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343544 + ... + 343607.

It is an arithmetic number, because the mean of its divisors is an integer number (3607548).

Almost surely, 2^21988832 is an apocalyptic number.

It is an amenable number.

21988832 is a deficient number, since it is larger than the sum of its proper divisors (21301744).

21988832 is an equidigital number, since it uses as much as digits as its factorization.

21988832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687161 (or 687153 counting only the distinct ones).

The product of its digits is 55296, while the sum is 41.

The square root of 21988832 is about 4689.2250958980. The cubic root of 21988832 is about 280.1565111384.

The spelling of 21988832 in words is "twenty-one million, nine hundred eighty-eight thousand, eight hundred thirty-two".