121855191121 has 8 divisors (see below), whose sum is σ = 122167872000. Its totient is φ = 121542879648.

The previous prime is 121855191103. The next prime is 121855191131. The reversal of 121855191121 is 121191558121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121855191121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121855191131) 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 7 ways as a sum of consecutive naturals, for example, 574380 + ... + 757378.

It is an arithmetic number, because the mean of its divisors is an integer number (15270984000).

Almost surely, 2^121855191121 is an apocalyptic number.

It is an amenable number.

121855191121 is a deficient number, since it is larger than the sum of its proper divisors (312680879).

121855191121 is a wasteful number, since it uses less digits than its factorization.

121855191121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184703.

The product of its digits is 7200, while the sum is 37.

The spelling of 121855191121 in words is "one hundred twenty-one billion, eight hundred fifty-five million, one hundred ninety-one thousand, one hundred twenty-one".