7221310390513 has 2 divisors, whose sum is σ = 7221310390514. Its totient is φ = 7221310390512.

The previous prime is 7221310390501. The next prime is 7221310390519. The reversal of 7221310390513 is 3150930131227.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6720708859489 + 500601531024 = 2592433^2 + 707532^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7221310390513 is a prime.

It is a super-2 number, since 2×7221310390513² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7221310390519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610655195256 + 3610655195257.

It is an arithmetic number, because the mean of its divisors is an integer number (3610655195257).

Almost surely, 2^{7221310390513} is an apocalyptic number.

It is an amenable number.

7221310390513 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221310390513 is an equidigital number, since it uses as much as digits as its factorization.

7221310390513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34020, while the sum is 37.

The spelling of 7221310390513 in words is "seven trillion, two hundred twenty-one billion, three hundred ten million, three hundred ninety thousand, five hundred thirteen".