21333608 has 16 divisors (see below), whose sum is σ = 41082180. Its totient is φ = 10378368.

The previous prime is 21333607. The next prime is 21333617. The reversal of 21333608 is 80633312.

It can be written as a sum of positive squares in 2 ways, for example, as 16144324 + 5189284 = 4018^2 + 2278^2 .

It is not an unprimeable number, because it can be changed into a prime (21333607) 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, 35741 + ... + 36332.

Almost surely, 2^21333608 is an apocalyptic number.

It is an amenable number.

21333608 is a deficient number, since it is larger than the sum of its proper divisors (19748572).

21333608 is a wasteful number, since it uses less digits than its factorization.

21333608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72116 (or 72112 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 21333608 is about 4618.8318869602. The cubic root of 21333608 is about 277.3457000053.

The spelling of 21333608 in words is "twenty-one million, three hundred thirty-three thousand, six hundred eight".