21382227 has 12 divisors (see below), whose sum is σ = 31543200. Its totient is φ = 13951248.

The previous prime is 21382181. The next prime is 21382241. The reversal of 21382227 is 72228312.

It is a happy number.

It is not a de Polignac number, because 21382227 - 2⁷ = 21382099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21382227.

It is not an unprimeable number, because it can be changed into a prime (21382247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24852 + ... + 25697.

It is an arithmetic number, because the mean of its divisors is an integer number (2628600).

Almost surely, 2^21382227 is an apocalyptic number.

21382227 is a deficient number, since it is larger than the sum of its proper divisors (10160973).

21382227 is a wasteful number, since it uses less digits than its factorization.

21382227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50602 (or 50599 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 21382227 is about 4624.0920189806. The cubic root of 21382227 is about 277.5562291705.

It can be divided in two parts, 21382 and 227, that added together give a square (21609 = 147²).

The spelling of 21382227 in words is "twenty-one million, three hundred eighty-two thousand, two hundred twenty-seven".