2121717212129 has 4 divisors (see below), whose sum is σ = 2166860131584. Its totient is φ = 2076574292676.

The previous prime is 2121717212077. The next prime is 2121717212149. The reversal of 2121717212129 is 9212127171212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121717212129 - 2⁴⁰ = 1022205584353 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2121717212092 and 2121717212101.

It is not an unprimeable number, because it can be changed into a prime (2121717212149) 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 in 3 ways as a sum of consecutive naturals, for example, 22571459657 + ... + 22571459750.

It is an arithmetic number, because the mean of its divisors is an integer number (541715032896).

Almost surely, 2^{2121717212129} is an apocalyptic number.

It is an amenable number.

2121717212129 is a deficient number, since it is larger than the sum of its proper divisors (45142919455).

2121717212129 is an equidigital number, since it uses as much as digits as its factorization.

2121717212129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45142919454.

The product of its digits is 14112, while the sum is 38.

The spelling of 2121717212129 in words is "two trillion, one hundred twenty-one billion, seven hundred seventeen million, two hundred twelve thousand, one hundred twenty-nine".