1321194814861 has 2 divisors, whose sum is σ = 1321194814862. Its totient is φ = 1321194814860.

The previous prime is 1321194814831. The next prime is 1321194814871. The reversal of 1321194814861 is 1684184911231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 916452009225 + 404742805636 = 957315^2 + 636194^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321194814861 - 2¹³ = 1321194806669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321194814831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660597407430 + 660597407431.

It is an arithmetic number, because the mean of its divisors is an integer number (660597407431).

Almost surely, 2^{1321194814861} is an apocalyptic number.

It is an amenable number.

1321194814861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321194814861 is an equidigital number, since it uses as much as digits as its factorization.

1321194814861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 49.

The spelling of 1321194814861 in words is "one trillion, three hundred twenty-one billion, one hundred ninety-four million, eight hundred fourteen thousand, eight hundred sixty-one".