31211212103 has 2 divisors, whose sum is σ = 31211212104. Its totient is φ = 31211212102.

The previous prime is 31211212099. The next prime is 31211212117. The reversal of 31211212103 is 30121211213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31211212103 - 2² = 31211212099 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31211212003) 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, 15605606051 + 15605606052.

It is an arithmetic number, because the mean of its divisors is an integer number (15605606052).

Almost surely, 2^31211212103 is an apocalyptic number.

31211212103 is a deficient number, since it is larger than the sum of its proper divisors (1).

31211212103 is an equidigital number, since it uses as much as digits as its factorization.

31211212103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31211212103 its reverse (30121211213), we get a palindrome (61332423316).

The spelling of 31211212103 in words is "thirty-one billion, two hundred eleven million, two hundred twelve thousand, one hundred three".