3131333222221 has 2 divisors, whose sum is σ = 3131333222222. Its totient is φ = 3131333222220.

The previous prime is 3131333222197. The next prime is 3131333222257. The reversal of 3131333222221 is 1222223331313.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2770606856196 + 360726366025 = 1664514^2 + 600605^2 .

It is a cyclic number.

It is not a de Polignac number, because 3131333222221 - 2⁴¹ = 932309966669 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3131333222221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3131333222921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565666611110 + 1565666611111.

It is an arithmetic number, because the mean of its divisors is an integer number (1565666611111).

Almost surely, 2^{3131333222221} is an apocalyptic number.

It is an amenable number.

3131333222221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131333222221 is an equidigital number, since it uses as much as digits as its factorization.

3131333222221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 28.

Adding to 3131333222221 its reverse (1222223331313), we get a palindrome (4353556553534).

The spelling of 3131333222221 in words is "three trillion, one hundred thirty-one billion, three hundred thirty-three million, two hundred twenty-two thousand, two hundred twenty-one".