22121211157 has 2 divisors, whose sum is σ = 22121211158. Its totient is φ = 22121211156.

The previous prime is 22121211143. The next prime is 22121211163. The reversal of 22121211157 is 75111212122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21877663921 + 243547236 = 147911^2 + 15606^2 .

It is a cyclic number.

It is not a de Polignac number, because 22121211157 - 2⁷ = 22121211029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22121211457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11060605578 + 11060605579.

It is an arithmetic number, because the mean of its divisors is an integer number (11060605579).

Almost surely, 2^22121211157 is an apocalyptic number.

It is an amenable number.

22121211157 is a deficient number, since it is larger than the sum of its proper divisors (1).

22121211157 is an equidigital number, since it uses as much as digits as its factorization.

22121211157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 560, while the sum is 25.

Adding to 22121211157 its reverse (75111212122), we get a palindrome (97232423279).

The spelling of 22121211157 in words is "twenty-two billion, one hundred twenty-one million, two hundred eleven thousand, one hundred fifty-seven".