1361206057721 has 2 divisors, whose sum is σ = 1361206057722. Its totient is φ = 1361206057720.

The previous prime is 1361206057663. The next prime is 1361206057723. The reversal of 1361206057721 is 1277506021631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1336946437696 + 24259620025 = 1156264^2 + 155755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1361206057721 - 2¹⁸ = 1361205795577 is a prime.

Together with 1361206057723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1361206057723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680603028860 + 680603028861.

It is an arithmetic number, because the mean of its divisors is an integer number (680603028861).

Almost surely, 2^{1361206057721} is an apocalyptic number.

It is an amenable number.

1361206057721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361206057721 is an equidigital number, since it uses as much as digits as its factorization.

1361206057721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 1361206057721 in words is "one trillion, three hundred sixty-one billion, two hundred six million, fifty-seven thousand, seven hundred twenty-one".