31742191421 has 2 divisors, whose sum is σ = 31742191422. Its totient is φ = 31742191420.

The previous prime is 31742191399. The next prime is 31742191433. The reversal of 31742191421 is 12419124713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24542668921 + 7199522500 = 156661^2 + 84850^2 .

It is a cyclic number.

It is not a de Polignac number, because 31742191421 - 2⁶ = 31742191357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31742191441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15871095710 + 15871095711.

It is an arithmetic number, because the mean of its divisors is an integer number (15871095711).

Almost surely, 2^31742191421 is an apocalyptic number.

It is an amenable number.

31742191421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31742191421 is an equidigital number, since it uses as much as digits as its factorization.

31742191421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The spelling of 31742191421 in words is "thirty-one billion, seven hundred forty-two million, one hundred ninety-one thousand, four hundred twenty-one".