21674227 has 2 divisors, whose sum is σ = 21674228. Its totient is φ = 21674226.

The previous prime is 21674221. The next prime is 21674249. The reversal of 21674227 is 72247612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21674227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21674221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10837113 + 10837114.

It is an arithmetic number, because the mean of its divisors is an integer number (10837114).

Almost surely, 2^21674227 is an apocalyptic number.

21674227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21674227 is an equidigital number, since it uses as much as digits as its factorization.

21674227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 31.

The square root of 21674227 is about 4655.5587204975. The cubic root of 21674227 is about 278.8139756770.

The spelling of 21674227 in words is "twenty-one million, six hundred seventy-four thousand, two hundred twenty-seven".