1221126359197 has 2 divisors, whose sum is σ = 1221126359198. Its totient is φ = 1221126359196.

The previous prime is 1221126359183. The next prime is 1221126359203. The reversal of 1221126359197 is 7919536211221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1167910328601 + 53216030596 = 1080699^2 + 230686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221126359197 - 2¹⁵ = 1221126326429 is a prime.

It is a super-2 number, since 2×1221126359197² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221126359197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221126359597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610563179598 + 610563179599.

It is an arithmetic number, because the mean of its divisors is an integer number (610563179599).

Almost surely, 2^{1221126359197} is an apocalyptic number.

It is an amenable number.

1221126359197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221126359197 is an equidigital number, since it uses as much as digits as its factorization.

1221126359197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 49.

The spelling of 1221126359197 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-six million, three hundred fifty-nine thousand, one hundred ninety-seven".