121855191119 has 4 divisors (see below), whose sum is σ = 121970041560. Its totient is φ = 121740340680.

The previous prime is 121855191103. The next prime is 121855191131. The reversal of 121855191119 is 911191558121.

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 121855191119 - 2⁴ = 121855191103 is a prime.

It is a super-2 number, since 2×121855191119² (a number of 23 digits) contains 22 as substring.

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 121855191119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121855191919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57423629 + ... + 57425750.

It is an arithmetic number, because the mean of its divisors is an integer number (30492510390).

Almost surely, 2^121855191119 is an apocalyptic number.

121855191119 is a deficient number, since it is larger than the sum of its proper divisors (114850441).

121855191119 is a wasteful number, since it uses less digits than its factorization.

121855191119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114850440.

The product of its digits is 32400, while the sum is 44.

The spelling of 121855191119 in words is "one hundred twenty-one billion, eight hundred fifty-five million, one hundred ninety-one thousand, one hundred nineteen".