2121021110191 has 2 divisors, whose sum is σ = 2121021110192. Its totient is φ = 2121021110190.

The previous prime is 2121021110183. The next prime is 2121021110213. The reversal of 2121021110191 is 1910111201212.

It is a happy number.

It is an a-pointer prime, because the next prime (2121021110213) can be obtained adding 2121021110191 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121021110191 - 2³ = 2121021110183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121021110291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060510555095 + 1060510555096.

It is an arithmetic number, because the mean of its divisors is an integer number (1060510555096).

Almost surely, 2^{2121021110191} is an apocalyptic number.

2121021110191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121021110191 is an equidigital number, since it uses as much as digits as its factorization.

2121021110191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 2121021110191 in words is "two trillion, one hundred twenty-one billion, twenty-one million, one hundred ten thousand, one hundred ninety-one".