31017366421 has 2 divisors, whose sum is σ = 31017366422. Its totient is φ = 31017366420.

The previous prime is 31017366397. The next prime is 31017366433. The reversal of 31017366421 is 12466371013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31007688100 + 9678321 = 176090^2 + 3111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31017366421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31017366481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15508683210 + 15508683211.

It is an arithmetic number, because the mean of its divisors is an integer number (15508683211).

Almost surely, 2^31017366421 is an apocalyptic number.

It is an amenable number.

31017366421 is a deficient number, since it is larger than the sum of its proper divisors (1).

31017366421 is an equidigital number, since it uses as much as digits as its factorization.

31017366421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 31017366421 in words is "thirty-one billion, seventeen million, three hundred sixty-six thousand, four hundred twenty-one".