21179408 has 20 divisors (see below), whose sum is σ = 41129808. Its totient is φ = 10565280.

The previous prime is 21179401. The next prime is 21179413. The reversal of 21179408 is 80497112.

It is not an unprimeable number, because it can be changed into a prime (21179401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7103 + ... + 9633.

Almost surely, 2^21179408 is an apocalyptic number.

It is an amenable number.

21179408 is a deficient number, since it is larger than the sum of its proper divisors (19950400).

21179408 is a wasteful number, since it uses less digits than its factorization.

21179408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3062 (or 3056 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 21179408 is about 4602.1090817146. The cubic root of 21179408 is about 276.6758623417.

The spelling of 21179408 in words is "twenty-one million, one hundred seventy-nine thousand, four hundred eight".