2120105927917 has 2 divisors, whose sum is σ = 2120105927918. Its totient is φ = 2120105927916.

The previous prime is 2120105927909. The next prime is 2120105927939. The reversal of 2120105927917 is 7197295010212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2044310882436 + 75795045481 = 1429794^2 + 275309^2 .

It is a cyclic number.

It is not a de Polignac number, because 2120105927917 - 2³ = 2120105927909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120105927977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060052963958 + 1060052963959.

It is an arithmetic number, because the mean of its divisors is an integer number (1060052963959).

Almost surely, 2^{2120105927917} is an apocalyptic number.

It is an amenable number.

2120105927917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120105927917 is an equidigital number, since it uses as much as digits as its factorization.

2120105927917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 46.

The spelling of 2120105927917 in words is "two trillion, one hundred twenty billion, one hundred five million, nine hundred twenty-seven thousand, nine hundred seventeen".