21255327 has 24 divisors (see below), whose sum is σ = 31711680. Its totient is φ = 13711680.

The previous prime is 21255323. The next prime is 21255329. The reversal of 21255327 is 72355212.

21255327 is a `hidden beast` number, since 2 + 125 + 532 + 7 = 666.

It is not a de Polignac number, because 21255327 - 2² = 21255323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21255327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45877 + ... + 46337.

It is an arithmetic number, because the mean of its divisors is an integer number (1321320).

Almost surely, 2^21255327 is an apocalyptic number.

21255327 is a deficient number, since it is larger than the sum of its proper divisors (10456353).

21255327 is a wasteful number, since it uses less digits than its factorization.

21255327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 620 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 21255327 is about 4610.3499867147. The cubic root of 21255327 is about 277.0060558134.

The spelling of 21255327 in words is "twenty-one million, two hundred fifty-five thousand, three hundred twenty-seven".