21694368 has 24 divisors (see below), whose sum is σ = 56947968. Its totient is φ = 7231424.

The previous prime is 21694367. The next prime is 21694381. The reversal of 21694368 is 86349612.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (21694367) 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, 112896 + ... + 113087.

It is an arithmetic number, because the mean of its divisors is an integer number (2372832).

Almost surely, 2^21694368 is an apocalyptic number.

It is an amenable number.

21694368 is an abundant number, since it is smaller than the sum of its proper divisors (35253600).

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

21694368 is a wasteful number, since it uses less digits than its factorization.

21694368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225996 (or 225988 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 21694368 is about 4657.7213312949. The cubic root of 21694368 is about 278.9003125312.

The spelling of 21694368 in words is "twenty-one million, six hundred ninety-four thousand, three hundred sixty-eight".