210120220091 has 2 divisors, whose sum is σ = 210120220092. Its totient is φ = 210120220090.

The previous prime is 210120220033. The next prime is 210120220109. The reversal of 210120220091 is 190022021012.

It is a happy number.

210120220091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (210120220109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 210120220091 - 2²² = 210116025787 is a prime.

It is not a weakly prime, because it can be changed into another prime (210120220591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060110045 + 105060110046.

It is an arithmetic number, because the mean of its divisors is an integer number (105060110046).

Almost surely, 2^210120220091 is an apocalyptic number.

210120220091 is a deficient number, since it is larger than the sum of its proper divisors (1).

210120220091 is an equidigital number, since it uses as much as digits as its factorization.

210120220091 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 20.

The spelling of 210120220091 in words is "two hundred ten billion, one hundred twenty million, two hundred twenty thousand, ninety-one".