22455221 has 2 divisors, whose sum is σ = 22455222. Its totient is φ = 22455220.

The previous prime is 22455217. The next prime is 22455269. The reversal of 22455221 is 12255422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13060996 + 9394225 = 3614^2 + 3065^2 .

It is a cyclic number.

It is not a de Polignac number, because 22455221 - 2² = 22455217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22455281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11227610 + 11227611.

It is an arithmetic number, because the mean of its divisors is an integer number (11227611).

Almost surely, 2^22455221 is an apocalyptic number.

It is an amenable number.

22455221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22455221 is an equidigital number, since it uses as much as digits as its factorization.

22455221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1600, while the sum is 23.

The square root of 22455221 is about 4738.6940183979. The cubic root of 22455221 is about 282.1234013854.

The spelling of 22455221 in words is "twenty-two million, four hundred fifty-five thousand, two hundred twenty-one".