21274875 has 24 divisors (see below), whose sum is σ = 38353536. Its totient is φ = 11346000.

The previous prime is 21274873. The next prime is 21274907. The reversal of 21274875 is 57847212.

It is not a de Polignac number, because 21274875 - 2¹ = 21274873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21274873) 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, 8331 + ... + 10580.

It is an arithmetic number, because the mean of its divisors is an integer number (1598064).

Almost surely, 2^21274875 is an apocalyptic number.

21274875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21274875 is a deficient number, since it is larger than the sum of its proper divisors (17078661).

21274875 is a wasteful number, since it uses less digits than its factorization.

21274875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18932 (or 18919 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 21274875 is about 4612.4695120944. The cubic root of 21274875 is about 277.0909483400.

The spelling of 21274875 in words is "twenty-one million, two hundred seventy-four thousand, eight hundred seventy-five".