31220513102123 has 2 divisors, whose sum is σ = 31220513102124. Its totient is φ = 31220513102122.

The previous prime is 31220513102069. The next prime is 31220513102137. The reversal of 31220513102123 is 32120131502213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31220513102123 - 2¹⁴ = 31220513085739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31220513102092 and 31220513102101.

It is not a weakly prime, because it can be changed into another prime (31220513102143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610256551061 + 15610256551062.

It is an arithmetic number, because the mean of its divisors is an integer number (15610256551062).

Almost surely, 2^{31220513102123} is an apocalyptic number.

31220513102123 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220513102123 is an equidigital number, since it uses as much as digits as its factorization.

31220513102123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 31220513102123 its reverse (32120131502213), we get a palindrome (63340644604336).

The spelling of 31220513102123 in words is "thirty-one trillion, two hundred twenty billion, five hundred thirteen million, one hundred two thousand, one hundred twenty-three".