2121101122391 has 2 divisors, whose sum is σ = 2121101122392. Its totient is φ = 2121101122390.

The previous prime is 2121101122373. The next prime is 2121101122417. The reversal of 2121101122391 is 1932211011212.

It is an a-pointer prime, because the next prime (2121101122417) can be obtained adding 2121101122391 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121101122391 - 2¹⁰ = 2121101121367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121101122391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121101122291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060550561195 + 1060550561196.

It is an arithmetic number, because the mean of its divisors is an integer number (1060550561196).

Almost surely, 2^{2121101122391} is an apocalyptic number.

2121101122391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121101122391 is an equidigital number, since it uses as much as digits as its factorization.

2121101122391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The spelling of 2121101122391 in words is "two trillion, one hundred twenty-one billion, one hundred one million, one hundred twenty-two thousand, three hundred ninety-one".