22565221121 has 2 divisors, whose sum is σ = 22565221122. Its totient is φ = 22565221120.

The previous prime is 22565221097. The next prime is 22565221141. The reversal of 22565221121 is 12112256522.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15552833521 + 7012387600 = 124711^2 + 83740^2 .

It is a cyclic number.

It is not a de Polignac number, because 22565221121 - 2²⁶ = 22498112257 is a prime.

It is not a weakly prime, because it can be changed into another prime (22565221141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11282610560 + 11282610561.

It is an arithmetic number, because the mean of its divisors is an integer number (11282610561).

Almost surely, 2^22565221121 is an apocalyptic number.

It is an amenable number.

22565221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22565221121 is an equidigital number, since it uses as much as digits as its factorization.

22565221121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4800, while the sum is 29.

Adding to 22565221121 its reverse (12112256522), we get a palindrome (34677477643).

The spelling of 22565221121 in words is "twenty-two billion, five hundred sixty-five million, two hundred twenty-one thousand, one hundred twenty-one".