2121202001917 has 2 divisors, whose sum is σ = 2121202001918. Its totient is φ = 2121202001916.

The previous prime is 2121202001887. The next prime is 2121202002047. The reversal of 2121202001917 is 7191002021212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2120369910201 + 832091716 = 1456149^2 + 28846^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121202001917 - 2¹⁵ = 2121201969149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121202001617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060601000958 + 1060601000959.

It is an arithmetic number, because the mean of its divisors is an integer number (1060601000959).

Almost surely, 2^{2121202001917} is an apocalyptic number.

It is an amenable number.

2121202001917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121202001917 is an equidigital number, since it uses as much as digits as its factorization.

2121202001917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 28.

The spelling of 2121202001917 in words is "two trillion, one hundred twenty-one billion, two hundred two million, one thousand, nine hundred seventeen".