21295408 has 10 divisors (see below), whose sum is σ = 41259884. Its totient is φ = 10647696.

The previous prime is 21295399. The next prime is 21295411. The reversal of 21295408 is 80459212.

It is a self number, because there is not a number n which added to its sum of digits gives 21295408.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665466 + ... + 665497.

Almost surely, 2^21295408 is an apocalyptic number.

It is an amenable number.

21295408 is a deficient number, since it is larger than the sum of its proper divisors (19964476).

21295408 is a wasteful number, since it uses less digits than its factorization.

21295408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330971 (or 1330965 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 21295408 is about 4614.6947894742. The cubic root of 21295408 is about 277.1800625190.

The spelling of 21295408 in words is "twenty-one million, two hundred ninety-five thousand, four hundred eight".