31440331313021 has 2 divisors, whose sum is σ = 31440331313022. Its totient is φ = 31440331313020.

The previous prime is 31440331313011. The next prime is 31440331313113. The reversal of 31440331313021 is 12031313304413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29948967679225 + 1491363633796 = 5472565^2 + 1221214^2 .

It is a cyclic number.

It is not a de Polignac number, because 31440331313021 - 2³⁸ = 31165453406077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31440331313011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15720165656510 + 15720165656511.

It is an arithmetic number, because the mean of its divisors is an integer number (15720165656511).

Almost surely, 2^{31440331313021} is an apocalyptic number.

It is an amenable number.

31440331313021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31440331313021 is an equidigital number, since it uses as much as digits as its factorization.

31440331313021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

Adding to 31440331313021 its reverse (12031313304413), we get a palindrome (43471644617434).

The spelling of 31440331313021 in words is "thirty-one trillion, four hundred forty billion, three hundred thirty-one million, three hundred thirteen thousand, twenty-one".