194936703421 has 2 divisors, whose sum is σ = 194936703422. Its totient is φ = 194936703420.

The previous prime is 194936703413. The next prime is 194936703491. The reversal of 194936703421 is 124307639491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174398947321 + 20537756100 = 417611^2 + 143310^2 .

It is a cyclic number.

It is not a de Polignac number, because 194936703421 - 2³ = 194936703413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194936703491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97468351710 + 97468351711.

It is an arithmetic number, because the mean of its divisors is an integer number (97468351711).

Almost surely, 2^194936703421 is an apocalyptic number.

It is an amenable number.

194936703421 is a deficient number, since it is larger than the sum of its proper divisors (1).

194936703421 is an equidigital number, since it uses as much as digits as its factorization.

194936703421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 49.

The spelling of 194936703421 in words is "one hundred ninety-four billion, nine hundred thirty-six million, seven hundred three thousand, four hundred twenty-one".