12121202020091 has 2 divisors, whose sum is σ = 12121202020092. Its totient is φ = 12121202020090.

The previous prime is 12121202020033. The next prime is 12121202020093. The reversal of 12121202020091 is 19002020212121.

It is a strong prime.

It is an emirp because it is prime and its reverse (19002020212121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12121202020091 - 2²⁶ = 12121134911227 is a prime.

Together with 12121202020093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12121202020093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060601010045 + 6060601010046.

It is an arithmetic number, because the mean of its divisors is an integer number (6060601010046).

Almost surely, 2^{12121202020091} is an apocalyptic number.

12121202020091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121202020091 is an equidigital number, since it uses as much as digits as its factorization.

12121202020091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

It can be divided in two parts, 121 and 21202020091, that added together give a palindrome (21202020212).

The spelling of 12121202020091 in words is "twelve trillion, one hundred twenty-one billion, two hundred two million, twenty thousand, ninety-one".