21365284 has 12 divisors (see below), whose sum is σ = 37422000. Its totient is φ = 10673288.

The previous prime is 21365269. The next prime is 21365299. The reversal of 21365284 is 48256312.

It is an interprime number because it is at equal distance from previous prime (21365269) and next prime (21365299).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6567 + ... + 9265.

It is an arithmetic number, because the mean of its divisors is an integer number (3118500).

Almost surely, 2^21365284 is an apocalyptic number.

It is an amenable number.

21365284 is a deficient number, since it is larger than the sum of its proper divisors (16056716).

21365284 is a wasteful number, since it uses less digits than its factorization.

21365284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4682 (or 4680 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 21365284 is about 4622.2596205752. The cubic root of 21365284 is about 277.4828991437.

The spelling of 21365284 in words is "twenty-one million, three hundred sixty-five thousand, two hundred eighty-four".