21353368 has 16 divisors (see below), whose sum is σ = 40331880. Its totient is φ = 10598208.

The previous prime is 21353357. The next prime is 21353383. The reversal of 21353368 is 86335312.

It is a congruent number.

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, 8646 + ... + 10837.

Almost surely, 2^21353368 is an apocalyptic number.

It is an amenable number.

21353368 is a deficient number, since it is larger than the sum of its proper divisors (18978512).

21353368 is a wasteful number, since it uses less digits than its factorization.

21353368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19626 (or 19622 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 21353368 is about 4620.9704608448. The cubic root of 21353368 is about 277.4313029636.

The spelling of 21353368 in words is "twenty-one million, three hundred fifty-three thousand, three hundred sixty-eight".