21479908 has 12 divisors (see below), whose sum is σ = 39801132. Its totient is φ = 10108160.

The previous prime is 21479881. The next prime is 21479911. The reversal of 21479908 is 80997412.

It can be written as a sum of positive squares in 2 ways, for example, as 10969344 + 10510564 = 3312^2 + 3242^2 .

It is a super-2 number, since 2×21479908² = 922772895376928, 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, 157873 + ... + 158008.

It is an arithmetic number, because the mean of its divisors is an integer number (3316761).

Almost surely, 2^21479908 is an apocalyptic number.

It is an amenable number.

21479908 is a deficient number, since it is larger than the sum of its proper divisors (18321224).

21479908 is a wasteful number, since it uses less digits than its factorization.

21479908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315902 (or 315900 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 21479908 is about 4634.6421652594. The cubic root of 21479908 is about 277.9782430396.

The spelling of 21479908 in words is "twenty-one million, four hundred seventy-nine thousand, nine hundred eight".