121011220091 has 4 divisors (see below), whose sum is σ = 121050756384. Its totient is φ = 120971683800.

The previous prime is 121011220087. The next prime is 121011220123. The reversal of 121011220091 is 190022110121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121011220091 - 2² = 121011220087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121011220391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19763555 + ... + 19769676.

It is an arithmetic number, because the mean of its divisors is an integer number (30262689096).

Almost surely, 2^121011220091 is an apocalyptic number.

121011220091 is a deficient number, since it is larger than the sum of its proper divisors (39536293).

121011220091 is an equidigital number, since it uses as much as digits as its factorization.

121011220091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39536292.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 121011220091 in words is "one hundred twenty-one billion, eleven million, two hundred twenty thousand, ninety-one".