21367208 has 16 divisors (see below), whose sum is σ = 40216500. Its totient is φ = 10642816.

The previous prime is 21367201. The next prime is 21367217. The reversal of 21367208 is 80276312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17825284 + 3541924 = 4222^2 + 1882^2 .

It is not an unprimeable number, because it can be changed into a prime (21367201) 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, 2813 + ... + 7116.

Almost surely, 2^21367208 is an apocalyptic number.

It is an amenable number.

21367208 is a deficient number, since it is larger than the sum of its proper divisors (18849292).

21367208 is a wasteful number, since it uses less digits than its factorization.

21367208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10204 (or 10200 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21367208 is about 4622.4677392060. The cubic root of 21367208 is about 277.4912282486.

The spelling of 21367208 in words is "twenty-one million, three hundred sixty-seven thousand, two hundred eight".