21366264 has 32 divisors (see below), whose sum is σ = 55739520. Its totient is φ = 6812256.

The previous prime is 21366259. The next prime is 21366271. The reversal of 21366264 is 46266312.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18802 + ... + 19905.

It is an arithmetic number, because the mean of its divisors is an integer number (1741860).

Almost surely, 2^21366264 is an apocalyptic number.

21366264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21366264 is an abundant number, since it is smaller than the sum of its proper divisors (34373256).

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

21366264 is a wasteful number, since it uses less digits than its factorization.

21366264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38739 (or 38735 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The square root of 21366264 is about 4622.3656281173. The cubic root of 21366264 is about 277.4871416816.

The spelling of 21366264 in words is "twenty-one million, three hundred sixty-six thousand, two hundred sixty-four".