21849227 has 2 divisors, whose sum is σ = 21849228. Its totient is φ = 21849226.

The previous prime is 21849181. The next prime is 21849257. The reversal of 21849227 is 72294812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21849227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21849257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10924613 + 10924614.

It is an arithmetic number, because the mean of its divisors is an integer number (10924614).

Almost surely, 2^21849227 is an apocalyptic number.

21849227 is a deficient number, since it is larger than the sum of its proper divisors (1).

21849227 is an equidigital number, since it uses as much as digits as its factorization.

21849227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 21849227 is about 4674.3156718390. The cubic root of 21849227 is about 279.5623562794.

It can be divided in two parts, 2184 and 9227, that added together give a palindrome (11411).

The spelling of 21849227 in words is "twenty-one million, eight hundred forty-nine thousand, two hundred twenty-seven".