5390239812421 has 2 divisors, whose sum is σ = 5390239812422. Its totient is φ = 5390239812420.

The previous prime is 5390239812371. The next prime is 5390239812443. The reversal of 5390239812421 is 1242189320935.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5005126481796 + 385113330625 = 2237214^2 + 620575^2 .

It is a cyclic number.

It is not a de Polignac number, because 5390239812421 - 2¹⁵ = 5390239779653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5390239812821) 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 as a sum of consecutive naturals, namely, 2695119906210 + 2695119906211.

It is an arithmetic number, because the mean of its divisors is an integer number (2695119906211).

Almost surely, 2^{5390239812421} is an apocalyptic number.

It is an amenable number.

5390239812421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5390239812421 is an equidigital number, since it uses as much as digits as its factorization.

5390239812421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 5390239812421 in words is "five trillion, three hundred ninety billion, two hundred thirty-nine million, eight hundred twelve thousand, four hundred twenty-one".