22721227 has 2 divisors, whose sum is σ = 22721228. Its totient is φ = 22721226.

The previous prime is 22721191. The next prime is 22721261. The reversal of 22721227 is 72212722.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22721227 - 2⁷ = 22721099 is a prime.

It is not a weakly prime, because it can be changed into another prime (22721267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11360613 + 11360614.

It is an arithmetic number, because the mean of its divisors is an integer number (11360614).

Almost surely, 2^22721227 is an apocalyptic number.

22721227 is a deficient number, since it is larger than the sum of its proper divisors (1).

22721227 is an equidigital number, since it uses as much as digits as its factorization.

22721227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1568, while the sum is 25.

The square root of 22721227 is about 4766.6788228283. The cubic root of 22721227 is about 283.2330485534.

Adding to 22721227 its reverse (72212722), we get a palindrome (94933949).

The spelling of 22721227 in words is "twenty-two million, seven hundred twenty-one thousand, two hundred twenty-seven".