2121010308917 has 2 divisors, whose sum is σ = 2121010308918. Its totient is φ = 2121010308916.

The previous prime is 2121010308889. The next prime is 2121010308953. The reversal of 2121010308917 is 7198030101212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2120559213796 + 451095121 = 1456214^2 + 21239^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121010308917 - 2⁶ = 2121010308853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121010308317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060505154458 + 1060505154459.

It is an arithmetic number, because the mean of its divisors is an integer number (1060505154459).

Almost surely, 2^{2121010308917} is an apocalyptic number.

It is an amenable number.

2121010308917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121010308917 is an equidigital number, since it uses as much as digits as its factorization.

2121010308917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 35.

The spelling of 2121010308917 in words is "two trillion, one hundred twenty-one billion, ten million, three hundred eight thousand, nine hundred seventeen".