210121022100191 has 2 divisors, whose sum is σ = 210121022100192. Its totient is φ = 210121022100190.

The previous prime is 210121022100049. The next prime is 210121022100257. The reversal of 210121022100191 is 191001220121012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210121022100191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210121022100791) 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, 105060511050095 + 105060511050096.

It is an arithmetic number, because the mean of its divisors is an integer number (105060511050096).

Almost surely, 2^{210121022100191} is an apocalyptic number.

210121022100191 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121022100191 is an equidigital number, since it uses as much as digits as its factorization.

210121022100191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 210121022100191 in words is "two hundred ten trillion, one hundred twenty-one billion, twenty-two million, one hundred thousand, one hundred ninety-one".