12221011121161 has 2 divisors, whose sum is σ = 12221011121162. Its totient is φ = 12221011121160.

The previous prime is 12221011121101. The next prime is 12221011121171. The reversal of 12221011121161 is 16112111012221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11274525355536 + 946485765625 = 3357756^2 + 972875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221011121161 is a prime.

It is a super-2 number, since 2×12221011121161² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12221011121101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110505560580 + 6110505560581.

It is an arithmetic number, because the mean of its divisors is an integer number (6110505560581).

Almost surely, 2^{12221011121161} is an apocalyptic number.

It is an amenable number.

12221011121161 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221011121161 is an equidigital number, since it uses as much as digits as its factorization.

12221011121161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 22.

Adding to 12221011121161 its reverse (16112111012221), we get a palindrome (28333122133382).

The spelling of 12221011121161 in words is "twelve trillion, two hundred twenty-one billion, eleven million, one hundred twenty-one thousand, one hundred sixty-one".