19339440321961 has 2 divisors, whose sum is σ = 19339440321962. Its totient is φ = 19339440321960.

The previous prime is 19339440321899. The next prime is 19339440321989. The reversal of 19339440321961 is 16912304493391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18593732082025 + 745708239936 = 4312045^2 + 863544^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19339440321961 is a prime.

It is not a weakly prime, because it can be changed into another prime (19339440321991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9669720160980 + 9669720160981.

It is an arithmetic number, because the mean of its divisors is an integer number (9669720160981).

Almost surely, 2^{19339440321961} is an apocalyptic number.

It is an amenable number.

19339440321961 is a deficient number, since it is larger than the sum of its proper divisors (1).

19339440321961 is an equidigital number, since it uses as much as digits as its factorization.

19339440321961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3779136, while the sum is 55.

The spelling of 19339440321961 in words is "nineteen trillion, three hundred thirty-nine billion, four hundred forty million, three hundred twenty-one thousand, nine hundred sixty-one".