3113202321721 has 2 divisors, whose sum is σ = 3113202321722. Its totient is φ = 3113202321720.

The previous prime is 3113202321683. The next prime is 3113202321781. The reversal of 3113202321721 is 1271232023113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3109452596496 + 3749725225 = 1763364^2 + 61235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3113202321721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3113202321721.

It is not a weakly prime, because it can be changed into another prime (3113202321781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1556601160860 + 1556601160861.

It is an arithmetic number, because the mean of its divisors is an integer number (1556601160861).

Almost surely, 2^{3113202321721} is an apocalyptic number.

It is an amenable number.

3113202321721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3113202321721 is an equidigital number, since it uses as much as digits as its factorization.

3113202321721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

Adding to 3113202321721 its reverse (1271232023113), we get a palindrome (4384434344834).

The spelling of 3113202321721 in words is "three trillion, one hundred thirteen billion, two hundred two million, three hundred twenty-one thousand, seven hundred twenty-one".