1321231213277 has 2 divisors, whose sum is σ = 1321231213278. Its totient is φ = 1321231213276.

The previous prime is 1321231213207. The next prime is 1321231213279. The reversal of 1321231213277 is 7723121321231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1181784235801 + 139446977476 = 1087099^2 + 373426^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321231213277 - 2²⁶ = 1321164104413 is a prime.

It is a super-2 number, since 2×1321231213277² (a number of 25 digits) contains 22 as substring.

Together with 1321231213279, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321231213279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660615606638 + 660615606639.

It is an arithmetic number, because the mean of its divisors is an integer number (660615606639).

Almost surely, 2^{1321231213277} is an apocalyptic number.

It is an amenable number.

1321231213277 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321231213277 is an equidigital number, since it uses as much as digits as its factorization.

1321231213277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 35.

The spelling of 1321231213277 in words is "one trillion, three hundred twenty-one billion, two hundred thirty-one million, two hundred thirteen thousand, two hundred seventy-seven".