121999292718263 has 2 divisors, whose sum is σ = 121999292718264. Its totient is φ = 121999292718262.

The previous prime is 121999292718239. The next prime is 121999292718269. The reversal of 121999292718263 is 362817292999121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121999292718263 - 2³⁸ = 121724414811319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121999292718269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60999646359131 + 60999646359132.

It is an arithmetic number, because the mean of its divisors is an integer number (60999646359132).

Almost surely, 2^{121999292718263} is an apocalyptic number.

121999292718263 is a deficient number, since it is larger than the sum of its proper divisors (1).

121999292718263 is an equidigital number, since it uses as much as digits as its factorization.

121999292718263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105815808, while the sum is 71.

The spelling of 121999292718263 in words is "one hundred twenty-one trillion, nine hundred ninety-nine billion, two hundred ninety-two million, seven hundred eighteen thousand, two hundred sixty-three".