21232704 has 28 divisors (see below), whose sum is σ = 56178704. Its totient is φ = 7077504.

The previous prime is 21232699. The next prime is 21232723. The reversal of 21232704 is 40723212.

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 3 ways as a sum of consecutive naturals, for example, 55102 + ... + 55485.

Almost surely, 2^21232704 is an apocalyptic number.

21232704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21232704 is an abundant number, since it is smaller than the sum of its proper divisors (34946000).

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

21232704 is a wasteful number, since it uses less digits than its factorization.

21232704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110602 (or 110592 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 21232704 is about 4607.8958321559. The cubic root of 21232704 is about 276.9077442603.

Adding to 21232704 its reverse (40723212), we get a palindrome (61955916).

The spelling of 21232704 in words is "twenty-one million, two hundred thirty-two thousand, seven hundred four".