31032212212121 has 2 divisors, whose sum is σ = 31032212212122. Its totient is φ = 31032212212120.

The previous prime is 31032212212117. The next prime is 31032212212123. The reversal of 31032212212121 is 12121221223013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18874124158096 + 12158088054025 = 4344436^2 + 3486845^2 .

It is a cyclic number.

It is not a de Polignac number, because 31032212212121 - 2² = 31032212212117 is a prime.

It is a super-2 number, since 2×31032212212121² (a number of 28 digits) contains 22 as substring.

Together with 31032212212123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31032212212123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15516106106060 + 15516106106061.

It is an arithmetic number, because the mean of its divisors is an integer number (15516106106061).

Almost surely, 2^{31032212212121} is an apocalyptic number.

It is an amenable number.

31032212212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31032212212121 is an equidigital number, since it uses as much as digits as its factorization.

31032212212121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 31032212212121 its reverse (12121221223013), we get a palindrome (43153433435134).

The spelling of 31032212212121 in words is "thirty-one trillion, thirty-two billion, two hundred twelve million, two hundred twelve thousand, one hundred twenty-one".