31230121220929 has 2 divisors, whose sum is σ = 31230121220930. Its totient is φ = 31230121220928.

The previous prime is 31230121220917. The next prime is 31230121221037. The reversal of 31230121220929 is 92902212103213.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20265545982529 + 10964575238400 = 4501727^2 + 3311280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31230121220929 is a prime.

It is not a weakly prime, because it can be changed into another prime (31230121260929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15615060610464 + 15615060610465.

It is an arithmetic number, because the mean of its divisors is an integer number (15615060610465).

Almost surely, 2^{31230121220929} is an apocalyptic number.

It is an amenable number.

31230121220929 is a deficient number, since it is larger than the sum of its proper divisors (1).

31230121220929 is an equidigital number, since it uses as much as digits as its factorization.

31230121220929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 31230121220929 in words is "thirty-one trillion, two hundred thirty billion, one hundred twenty-one million, two hundred twenty thousand, nine hundred twenty-nine".