12211212257 has 2 divisors, whose sum is σ = 12211212258. Its totient is φ = 12211212256.

The previous prime is 12211212161. The next prime is 12211212287. The reversal of 12211212257 is 75221211221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11081983441 + 1129228816 = 105271^2 + 33604^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211212257 - 2³⁰ = 11137470433 is a prime.

It is a super-2 number, since 2×12211212257² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12211212287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105606128 + 6105606129.

It is an arithmetic number, because the mean of its divisors is an integer number (6105606129).

Almost surely, 2^12211212257 is an apocalyptic number.

It is an amenable number.

12211212257 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211212257 is an equidigital number, since it uses as much as digits as its factorization.

12211212257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 26.

Adding to 12211212257 its reverse (75221211221), we get a palindrome (87432423478).

The spelling of 12211212257 in words is "twelve billion, two hundred eleven million, two hundred twelve thousand, two hundred fifty-seven".