21367608 has 16 divisors (see below), whose sum is σ = 53419080. Its totient is φ = 7122528.

The previous prime is 21367607. The next prime is 21367613. The reversal of 21367608 is 80676312.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21367607) 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, 445135 + ... + 445182.

Almost surely, 2^21367608 is an apocalyptic number.

It is an amenable number.

21367608 is an abundant number, since it is smaller than the sum of its proper divisors (32051472).

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

21367608 is a wasteful number, since it uses less digits than its factorization.

21367608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890326 (or 890322 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 21367608 is about 4622.5110059361. The cubic root of 21367608 is about 277.4929598084.

The spelling of 21367608 in words is "twenty-one million, three hundred sixty-seven thousand, six hundred eight".