21493368 has 48 divisors (see below), whose sum is σ = 62691720. Its totient is φ = 6613056.

The previous prime is 21493363. The next prime is 21493387. The reversal of 21493368 is 86339412.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21493363) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10546 + ... + 12417.

Almost surely, 2^21493368 is an apocalyptic number.

It is an amenable number.

21493368 is an abundant number, since it is smaller than the sum of its proper divisors (41198352).

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

21493368 is a wasteful number, since it uses less digits than its factorization.

21493368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22988 (or 22981 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 21493368 is about 4636.0940456380. The cubic root of 21493368 is about 278.0362942797.

The spelling of 21493368 in words is "twenty-one million, four hundred ninety-three thousand, three hundred sixty-eight".