21404696 has 8 divisors (see below), whose sum is σ = 40133820. Its totient is φ = 10702344.

The previous prime is 21404689. The next prime is 21404729. The reversal of 21404696 is 69640412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21404696² = 916322021704832, which contains 22 as substring.

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, 1337786 + ... + 1337801.

Almost surely, 2^21404696 is an apocalyptic number.

It is an amenable number.

21404696 is a deficient number, since it is larger than the sum of its proper divisors (18729124).

21404696 is a wasteful number, since it uses less digits than its factorization.

21404696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2675593 (or 2675589 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 21404696 is about 4626.5209391075. The cubic root of 21404696 is about 277.6534162366.

The spelling of 21404696 in words is "twenty-one million, four hundred four thousand, six hundred ninety-six".