21294368 has 24 divisors (see below), whose sum is σ = 42614460. Its totient is φ = 10471680.

The previous prime is 21294359. The next prime is 21294373. The reversal of 21294368 is 86349212.

It can be written as a sum of positive squares in 2 ways, for example, as 17405584 + 3888784 = 4172^2 + 1972^2 .

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, 3503 + ... + 7406.

Almost surely, 2^21294368 is an apocalyptic number.

It is an amenable number.

21294368 is an abundant number, since it is smaller than the sum of its proper divisors (21320092).

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

21294368 is a wasteful number, since it uses less digits than its factorization.

21294368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10980 (or 10972 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 21294368 is about 4614.5821045898. The cubic root of 21294368 is about 277.1755502479.

The spelling of 21294368 in words is "twenty-one million, two hundred ninety-four thousand, three hundred sixty-eight".