21479208 has 32 divisors (see below), whose sum is σ = 54225600. Its totient is φ = 7089408.

The previous prime is 21479191. The next prime is 21479209. The reversal of 21479208 is 80297412.

It is a happy number.

It is a super-2 number, since 2×21479208² = 922712752614528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21479209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1873 + ... + 6816.

It is an arithmetic number, because the mean of its divisors is an integer number (1694550).

Almost surely, 2^21479208 is an apocalyptic number.

It is an amenable number.

21479208 is an abundant number, since it is smaller than the sum of its proper divisors (32746392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21479208 is a wasteful number, since it uses less digits than its factorization.

21479208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8801 (or 8797 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 21479208 is about 4634.5666464083. The cubic root of 21479208 is about 277.9752233668.

The spelling of 21479208 in words is "twenty-one million, four hundred seventy-nine thousand, two hundred eight".