201210120091 has 2 divisors, whose sum is σ = 201210120092. Its totient is φ = 201210120090.

The previous prime is 201210120019. The next prime is 201210120113. The reversal of 201210120091 is 190021012102.

It is a happy number.

Together with previous prime (201210120019) 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 201210120091 - 2⁷ = 201210119963 is a prime.

It is not a weakly prime, because it can be changed into another prime (201210120011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100605060045 + 100605060046.

It is an arithmetic number, because the mean of its divisors is an integer number (100605060046).

Almost surely, 2^201210120091 is an apocalyptic number.

201210120091 is a deficient number, since it is larger than the sum of its proper divisors (1).

201210120091 is an equidigital number, since it uses as much as digits as its factorization.

201210120091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 201210120091 its reverse (190021012102), we get a palindrome (391231132193).

The spelling of 201210120091 in words is "two hundred one billion, two hundred ten million, one hundred twenty thousand, ninety-one".