21869264 has 10 divisors (see below), whose sum is σ = 42371730. Its totient is φ = 10934624.

The previous prime is 21869249. The next prime is 21869279. The reversal of 21869264 is 46296812.

It is an interprime number because it is at equal distance from previous prime (21869249) and next prime (21869279).

It can be written as a sum of positive squares in only one way, i.e., 21715600 + 153664 = 4660^2 + 392^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683399 + ... + 683430.

It is an arithmetic number, because the mean of its divisors is an integer number (4237173).

Almost surely, 2^21869264 is an apocalyptic number.

It is an amenable number.

21869264 is a deficient number, since it is larger than the sum of its proper divisors (20502466).

21869264 is a wasteful number, since it uses less digits than its factorization.

21869264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366837 (or 1366831 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 21869264 is about 4676.4584890705. The cubic root of 21869264 is about 279.6477884319.

The spelling of 21869264 in words is "twenty-one million, eight hundred sixty-nine thousand, two hundred sixty-four".