22268221 has 2 divisors, whose sum is σ = 22268222. Its totient is φ = 22268220.

The previous prime is 22268219. The next prime is 22268237. The reversal of 22268221 is 12286222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 784996 = 4635^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 22268221 - 2¹ = 22268219 is a prime.

Together with 22268219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22268021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11134110 + 11134111.

It is an arithmetic number, because the mean of its divisors is an integer number (11134111).

Almost surely, 2^22268221 is an apocalyptic number.

It is an amenable number.

22268221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22268221 is an equidigital number, since it uses as much as digits as its factorization.

22268221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 25.

The square root of 22268221 is about 4718.9215929066. The cubic root of 22268221 is about 281.3380724340.

The spelling of 22268221 in words is "twenty-two million, two hundred sixty-eight thousand, two hundred twenty-one".