1221312767293 has 2 divisors, whose sum is σ = 1221312767294. Its totient is φ = 1221312767292.

The previous prime is 1221312767263. The next prime is 1221312767377. The reversal of 1221312767293 is 3927672131221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1171128702969 + 50184064324 = 1082187^2 + 224018^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221312767293 - 2⁵ = 1221312767261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221312767243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610656383646 + 610656383647.

It is an arithmetic number, because the mean of its divisors is an integer number (610656383647).

Almost surely, 2^{1221312767293} is an apocalyptic number.

It is an amenable number.

1221312767293 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221312767293 is an equidigital number, since it uses as much as digits as its factorization.

1221312767293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 46.

The spelling of 1221312767293 in words is "one trillion, two hundred twenty-one billion, three hundred twelve million, seven hundred sixty-seven thousand, two hundred ninety-three".