21274227 has 36 divisors (see below), whose sum is σ = 33915024. Its totient is φ = 12841920.

The previous prime is 21274219. The next prime is 21274237. The reversal of 21274227 is 72247212.

It is not a de Polignac number, because 21274227 - 2³ = 21274219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21274227.

It is not an unprimeable number, because it can be changed into a prime (21274237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 107893 + ... + 108089.

It is an arithmetic number, because the mean of its divisors is an integer number (942084).

Almost surely, 2^21274227 is an apocalyptic number.

21274227 is a deficient number, since it is larger than the sum of its proper divisors (12640797).

21274227 is a wasteful number, since it uses less digits than its factorization.

21274227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300 (or 284 counting only the distinct ones).

The product of its digits is 3136, while the sum is 27.

The square root of 21274227 is about 4612.3992671927. The cubic root of 21274227 is about 277.0881350566.

The spelling of 21274227 in words is "twenty-one million, two hundred seventy-four thousand, two hundred twenty-seven".