21934368 has 96 divisors (see below), whose sum is σ = 65318400. Its totient is φ = 7158528.

The previous prime is 21934357. The next prime is 21934373. The reversal of 21934368 is 86343912.

21934368 is a `hidden beast` number, since 219 + 3 + 436 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×21934368² = 962232999118848, which contains 22 as substring.

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 an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45553 + ... + 46031.

It is an arithmetic number, because the mean of its divisors is an integer number (680400).

Almost surely, 2^21934368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21934368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32659200).

21934368 is an abundant number, since it is smaller than the sum of its proper divisors (43384032).

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

21934368 is a wasteful number, since it uses less digits than its factorization.

21934368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 537 counting only the distinct ones).

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

The square root of 21934368 is about 4683.4141392792. The cubic root of 21934368 is about 279.9250139336.

It can be divided in two parts, 2193 and 4368, that added together give a 8-th power (6561 = 3⁸).

The spelling of 21934368 in words is "twenty-one million, nine hundred thirty-four thousand, three hundred sixty-eight".