22806221 has 2 divisors, whose sum is σ = 22806222. Its totient is φ = 22806220.

The previous prime is 22806191. The next prime is 22806229. The reversal of 22806221 is 12260822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22458121 + 348100 = 4739^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 22806221 - 2²² = 18611917 is a prime.

It is a Sophie Germain prime.

It is a Chen 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 (22806229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11403110 + 11403111.

It is an arithmetic number, because the mean of its divisors is an integer number (11403111).

Almost surely, 2^22806221 is an apocalyptic number.

It is an amenable number.

22806221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22806221 is an equidigital number, since it uses as much as digits as its factorization.

22806221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 22806221 is about 4775.5859326370. The cubic root of 22806221 is about 283.5857753221.

The spelling of 22806221 in words is "twenty-two million, eight hundred six thousand, two hundred twenty-one".