210021210000191 has 2 divisors, whose sum is σ = 210021210000192. Its totient is φ = 210021210000190.

The previous prime is 210021210000139. The next prime is 210021210000281. The reversal of 210021210000191 is 191000012120012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021210000191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210021210000391) 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, 105010605000095 + 105010605000096.

It is an arithmetic number, because the mean of its divisors is an integer number (105010605000096).

Almost surely, 2^{210021210000191} is an apocalyptic number.

210021210000191 is a deficient number, since it is larger than the sum of its proper divisors (1).

210021210000191 is an equidigital number, since it uses as much as digits as its factorization.

210021210000191 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 20.

The spelling of 210021210000191 in words is "two hundred ten trillion, twenty-one billion, two hundred ten million, one hundred ninety-one", and thus it is an aban number.