5390239812721 has 9 divisors (see below), whose sum is σ = 5634843376729. Its totient is φ = 5155830482836.

The previous prime is 5390239812719. The next prime is 5390239812773. The reversal of 5390239812721 is 1272189320935.

The square root of 5390239812721 is 2321689.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 5390239812721 - 2¹ = 5390239812719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5390239812421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 53348376 + ... + 53449318.

Almost surely, 2^{5390239812721} is an apocalyptic number.

5390239812721 is the 2321689-th square number.

5390239812721 is the 1160845-th centered octagonal number.

It is an amenable number.

5390239812721 is a deficient number, since it is larger than the sum of its proper divisors (244603564008).

5390239812721 is an frugal number, since it uses more digits than its factorization.

5390239812721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201932 (or 100966 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 5390239812721 in words is "five trillion, three hundred ninety billion, two hundred thirty-nine million, eight hundred twelve thousand, seven hundred twenty-one".