121111122109 has 4 divisors (see below), whose sum is σ = 121202943840. Its totient is φ = 121019300380.

The previous prime is 121111122079. The next prime is 121111122113. The reversal of 121111122109 is 901221111121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121111122109 - 2³³ = 112521187517 is a prime.

It is a super-3 number, since 3×121111122109³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121111122109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111122809) 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, 45908887 + ... + 45911524.

It is an arithmetic number, because the mean of its divisors is an integer number (30300735960).

Almost surely, 2^121111122109 is an apocalyptic number.

It is an amenable number.

121111122109 is a deficient number, since it is larger than the sum of its proper divisors (91821731).

121111122109 is an equidigital number, since it uses as much as digits as its factorization.

121111122109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91821730.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 121111122109 in words is "one hundred twenty-one billion, one hundred eleven million, one hundred twenty-two thousand, one hundred nine".