21214528 has 28 divisors (see below), whose sum is σ = 42245280. Its totient is φ = 10570112.

The previous prime is 21214517. The next prime is 21214541. The reversal of 21214528 is 82541212.

It is a congruent number.

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, 31863 + ... + 32521.

It is an arithmetic number, because the mean of its divisors is an integer number (1508760).

Almost surely, 2^21214528 is an apocalyptic number.

It is an amenable number.

21214528 is a deficient number, since it is larger than the sum of its proper divisors (21030752).

21214528 is an equidigital number, since it uses as much as digits as its factorization.

21214528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174 (or 1164 counting only the distinct ones).

The product of its digits is 1280, while the sum is 25.

The square root of 21214528 is about 4605.9231430843. The cubic root of 21214528 is about 276.8287071923.

The spelling of 21214528 in words is "twenty-one million, two hundred fourteen thousand, five hundred twenty-eight".