21320332 has 24 divisors (see below), whose sum is σ = 40944960. Its totient is φ = 9633360.

The previous prime is 21320323. The next prime is 21320401. The reversal of 21320332 is 23302312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6523 + ... + 9229.

It is an arithmetic number, because the mean of its divisors is an integer number (1706040).

Almost surely, 2^21320332 is an apocalyptic number.

21320332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21320332 is a deficient number, since it is larger than the sum of its proper divisors (19624628).

21320332 is a wasteful number, since it uses less digits than its factorization.

21320332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2901 (or 2899 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21320332 is about 4617.3945033969. The cubic root of 21320332 is about 277.2881569093.

Adding to 21320332 its reverse (23302312), we get a palindrome (44622644).

The spelling of 21320332 in words is "twenty-one million, three hundred twenty thousand, three hundred thirty-two".