31220121312179 has 2 divisors, whose sum is σ = 31220121312180. Its totient is φ = 31220121312178.

The previous prime is 31220121312169. The next prime is 31220121312181. The reversal of 31220121312179 is 97121312102213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31220121312179 - 2⁴⁴ = 13627935267763 is a prime.

Together with 31220121312181, 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 (31220121312119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610060656089 + 15610060656090.

It is an arithmetic number, because the mean of its divisors is an integer number (15610060656090).

Almost surely, 2^{31220121312179} is an apocalyptic number.

31220121312179 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220121312179 is an equidigital number, since it uses as much as digits as its factorization.

31220121312179 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The spelling of 31220121312179 in words is "thirty-one trillion, two hundred twenty billion, one hundred twenty-one million, three hundred twelve thousand, one hundred seventy-nine".