3121321131893 has 2 divisors, whose sum is σ = 3121321131894. Its totient is φ = 3121321131892.

The previous prime is 3121321131889. The next prime is 3121321131937. The reversal of 3121321131893 is 3981311231213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2013013303249 + 1108307828644 = 1418807^2 + 1052762^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121321131893 - 2² = 3121321131889 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3121321131853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560660565946 + 1560660565947.

It is an arithmetic number, because the mean of its divisors is an integer number (1560660565947).

Almost surely, 2^{3121321131893} is an apocalyptic number.

It is an amenable number.

3121321131893 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121321131893 is an equidigital number, since it uses as much as digits as its factorization.

3121321131893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The spelling of 3121321131893 in words is "three trillion, one hundred twenty-one billion, three hundred twenty-one million, one hundred thirty-one thousand, eight hundred ninety-three".