121984387091 has 8 divisors (see below), whose sum is σ = 139420011360. Its totient is φ = 104551083648.

The previous prime is 121984387051. The next prime is 121984387093. The reversal of 121984387091 is 190783489121.

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

It is a cyclic number.

It is not a de Polignac number, because 121984387091 - 2¹⁰ = 121984386067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121984387093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 466076 + ... + 679113.

It is an arithmetic number, because the mean of its divisors is an integer number (17427501420).

Almost surely, 2^121984387091 is an apocalyptic number.

121984387091 is a deficient number, since it is larger than the sum of its proper divisors (17435624269).

121984387091 is a wasteful number, since it uses less digits than its factorization.

121984387091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160413.

The product of its (nonzero) digits is 870912, while the sum is 53.

The spelling of 121984387091 in words is "one hundred twenty-one billion, nine hundred eighty-four million, three hundred eighty-seven thousand, ninety-one".