31321302121 has 2 divisors, whose sum is σ = 31321302122. Its totient is φ = 31321302120.

The previous prime is 31321302113. The next prime is 31321302137. The reversal of 31321302121 is 12120312313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25448225625 + 5873076496 = 159525^2 + 76636^2 .

It is a cyclic number.

It is not a de Polignac number, because 31321302121 - 2³ = 31321302113 is a prime.

It is not a weakly prime, because it can be changed into another prime (31321302421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660651060 + 15660651061.

It is an arithmetic number, because the mean of its divisors is an integer number (15660651061).

Almost surely, 2^31321302121 is an apocalyptic number.

It is an amenable number.

31321302121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321302121 is an equidigital number, since it uses as much as digits as its factorization.

31321302121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31321302121 its reverse (12120312313), we get a palindrome (43441614434).

The spelling of 31321302121 in words is "thirty-one billion, three hundred twenty-one million, three hundred two thousand, one hundred twenty-one".