1311226108921 has 2 divisors, whose sum is σ = 1311226108922. Its totient is φ = 1311226108920.

The previous prime is 1311226108909. The next prime is 1311226108931. The reversal of 1311226108921 is 1298016221131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1302988005225 + 8238103696 = 1141485^2 + 90764^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311226108921 - 2¹⁹ = 1311225584633 is a prime.

It is a super-2 number, since 2×1311226108921² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1311226108931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655613054460 + 655613054461.

It is an arithmetic number, because the mean of its divisors is an integer number (655613054461).

Almost surely, 2^{1311226108921} is an apocalyptic number.

It is an amenable number.

1311226108921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311226108921 is an equidigital number, since it uses as much as digits as its factorization.

1311226108921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 1311226108921 in words is "one trillion, three hundred eleven billion, two hundred twenty-six million, one hundred eight thousand, nine hundred twenty-one".