2121012308917 has 2 divisors, whose sum is σ = 2121012308918. Its totient is φ = 2121012308916.

The previous prime is 2121012308897. The next prime is 2121012308939. The reversal of 2121012308917 is 7198032101212.

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., 1122213947716 + 998798361201 = 1059346^2 + 999399^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121012308917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121010308917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060506154458 + 1060506154459.

It is an arithmetic number, because the mean of its divisors is an integer number (1060506154459).

Almost surely, 2^{2121012308917} is an apocalyptic number.

It is an amenable number.

2121012308917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121012308917 is an equidigital number, since it uses as much as digits as its factorization.

2121012308917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 37.

The spelling of 2121012308917 in words is "two trillion, one hundred twenty-one billion, twelve million, three hundred eight thousand, nine hundred seventeen".