121101091 has 4 divisors (see below), whose sum is σ = 121914000. Its totient is φ = 120288184.

The previous prime is 121101089. The next prime is 121101107. The reversal of 121101091 is 190101121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190101121 = 7 ⋅27157303.

It is a cyclic number.

It is not a de Polignac number, because 121101091 - 2¹ = 121101089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121101011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406231 + ... + 406528.

It is an arithmetic number, because the mean of its divisors is an integer number (30478500).

Almost surely, 2^121101091 is an apocalyptic number.

121101091 is a deficient number, since it is larger than the sum of its proper divisors (812909).

121101091 is an equidigital number, since it uses as much as digits as its factorization.

121101091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812908.

The product of its (nonzero) digits is 18, while the sum is 16.

The square root of 121101091 is about 11004.5940861079. The cubic root of 121101091 is about 494.7464483869.

The spelling of 121101091 in words is "one hundred twenty-one million, one hundred one thousand, ninety-one".