2731563017321 has 2 divisors, whose sum is σ = 2731563017322. Its totient is φ = 2731563017320.

The previous prime is 2731563017221. The next prime is 2731563017329. The reversal of 2731563017321 is 1237103651372.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1645665637225 + 1085897380096 = 1282835^2 + 1042064^2 .

It is a cyclic number.

It is not a de Polignac number, because 2731563017321 - 2²⁶ = 2731495908457 is a prime.

It is a super-2 number, since 2×2731563017321² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2731563017329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1365781508660 + 1365781508661.

It is an arithmetic number, because the mean of its divisors is an integer number (1365781508661).

Almost surely, 2^{2731563017321} is an apocalyptic number.

It is an amenable number.

2731563017321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2731563017321 is an equidigital number, since it uses as much as digits as its factorization.

2731563017321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 41.

Adding to 2731563017321 its reverse (1237103651372), we get a palindrome (3968666668693).

The spelling of 2731563017321 in words is "two trillion, seven hundred thirty-one billion, five hundred sixty-three million, seventeen thousand, three hundred twenty-one".