21325828 has 12 divisors (see below), whose sum is σ = 39284560. Its totient is φ = 10101672.

The previous prime is 21325819. The next prime is 21325891. The reversal of 21325828 is 82852312.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21325828.

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, 140226 + ... + 140377.

Almost surely, 2^21325828 is an apocalyptic number.

It is an amenable number.

21325828 is a deficient number, since it is larger than the sum of its proper divisors (17958732).

21325828 is a wasteful number, since it uses less digits than its factorization.

21325828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280626 (or 280624 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 21325828 is about 4617.9896058783. The cubic root of 21325828 is about 277.3119815036.

The spelling of 21325828 in words is "twenty-one million, three hundred twenty-five thousand, eight hundred twenty-eight".