21404704 has 24 divisors (see below), whose sum is σ = 42653520. Its totient is φ = 10572096.

The previous prime is 21404689. The next prime is 21404729. The reversal of 21404704 is 40740412.

It is a super-2 number, since 2×21404704² = 916322706655232, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1374 + ... + 6685.

It is an arithmetic number, because the mean of its divisors is an integer number (1777230).

Almost surely, 2^21404704 is an apocalyptic number.

It is an amenable number.

21404704 is a deficient number, since it is larger than the sum of its proper divisors (21248816).

21404704 is an equidigital number, since it uses as much as digits as its factorization.

21404704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8152 (or 8144 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 21404704 is about 4626.5218036879. The cubic root of 21404704 is about 277.6534508276.

The spelling of 21404704 in words is "twenty-one million, four hundred four thousand, seven hundred four".