21922227 has 6 divisors (see below), whose sum is σ = 31665452. Its totient is φ = 14614812.

The previous prime is 21922223. The next prime is 21922237. The reversal of 21922227 is 72222912.

It is not a de Polignac number, because 21922227 - 2² = 21922223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21922227.

It is not an unprimeable number, because it can be changed into a prime (21922223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1217893 + ... + 1217910.

Almost surely, 2^21922227 is an apocalyptic number.

21922227 is a deficient number, since it is larger than the sum of its proper divisors (9743225).

21922227 is a wasteful number, since it uses less digits than its factorization.

21922227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2435809 (or 2435806 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 21922227 is about 4682.1177900604. The cubic root of 21922227 is about 279.8733568440.

The spelling of 21922227 in words is "twenty-one million, nine hundred twenty-two thousand, two hundred twenty-seven".