121210010091 has 8 divisors (see below), whose sum is σ = 179570385360. Its totient is φ = 80806673376.

The previous prime is 121210010087. The next prime is 121210010099. The reversal of 121210010091 is 190010012121.

It is a happy number.

It is not a de Polignac number, because 121210010091 - 2² = 121210010087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121210010099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2244629790 + ... + 2244629843.

It is an arithmetic number, because the mean of its divisors is an integer number (22446298170).

Almost surely, 2^121210010091 is an apocalyptic number.

121210010091 is a deficient number, since it is larger than the sum of its proper divisors (58360375269).

121210010091 is an equidigital number, since it uses as much as digits as its factorization.

121210010091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4489259642 (or 4489259636 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The spelling of 121210010091 in words is "one hundred twenty-one billion, two hundred ten million, ten thousand, ninety-one".