21148264 has 16 divisors (see below), whose sum is σ = 39715200. Its totient is φ = 10557552.

The previous prime is 21148249. The next prime is 21148271. The reversal of 21148264 is 46284112.

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, 4617 + ... + 7975.

It is an arithmetic number, because the mean of its divisors is an integer number (2482200).

Almost surely, 2^21148264 is an apocalyptic number.

It is an amenable number.

21148264 is a deficient number, since it is larger than the sum of its proper divisors (18566936).

21148264 is a wasteful number, since it uses less digits than its factorization.

21148264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4152 (or 4148 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 21148264 is about 4598.7241708978. The cubic root of 21148264 is about 276.5401799196.

It can be divided in two parts, 21148 and 264, that added together give a palindrome (21412).

The spelling of 21148264 in words is "twenty-one million, one hundred forty-eight thousand, two hundred sixty-four".