93423756421 has 2 divisors, whose sum is σ = 93423756422. Its totient is φ = 93423756420.

The previous prime is 93423756403. The next prime is 93423756443. The reversal of 93423756421 is 12465732439.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64218655396 + 29205101025 = 253414^2 + 170895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-93423756421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (93423753421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 46711878210 + 46711878211.

It is an arithmetic number, because the mean of its divisors is an integer number (46711878211).

Almost surely, 2^93423756421 is an apocalyptic number.

It is an amenable number.

93423756421 is a deficient number, since it is larger than the sum of its proper divisors (1).

93423756421 is an equidigital number, since it uses as much as digits as its factorization.

93423756421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 46.

The spelling of 93423756421 in words is "ninety-three billion, four hundred twenty-three million, seven hundred fifty-six thousand, four hundred twenty-one".