939331194421 has 2 divisors, whose sum is σ = 939331194422. Its totient is φ = 939331194420.

The previous prime is 939331194419. The next prime is 939331194449. The reversal of 939331194421 is 124491133939.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481239113796 + 458092080625 = 693714^2 + 676825^2 .

It is a cyclic number.

It is not a de Polignac number, because 939331194421 - 2¹ = 939331194419 is a prime.

Together with 939331194419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (939331194121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469665597210 + 469665597211.

It is an arithmetic number, because the mean of its divisors is an integer number (469665597211).

Almost surely, 2^939331194421 is an apocalyptic number.

It is an amenable number.

939331194421 is a deficient number, since it is larger than the sum of its proper divisors (1).

939331194421 is an equidigital number, since it uses as much as digits as its factorization.

939331194421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 629856, while the sum is 49.

The spelling of 939331194421 in words is "nine hundred thirty-nine billion, three hundred thirty-one million, one hundred ninety-four thousand, four hundred twenty-one".