31334440021 has 2 divisors, whose sum is σ = 31334440022. Its totient is φ = 31334440020.

The previous prime is 31334440013. The next prime is 31334440051. The reversal of 31334440021 is 12004443313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26040276900 + 5294163121 = 161370^2 + 72761^2 .

It is a cyclic number.

It is not a de Polignac number, because 31334440021 - 2³ = 31334440013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31334440051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15667220010 + 15667220011.

It is an arithmetic number, because the mean of its divisors is an integer number (15667220011).

Almost surely, 2^31334440021 is an apocalyptic number.

It is an amenable number.

31334440021 is a deficient number, since it is larger than the sum of its proper divisors (1).

31334440021 is an equidigital number, since it uses as much as digits as its factorization.

31334440021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 31334440021 its reverse (12004443313), we get a palindrome (43338883334).

The spelling of 31334440021 in words is "thirty-one billion, three hundred thirty-four million, four hundred forty thousand, twenty-one".