121801786400199 has 16 divisors (see below), whose sum is σ = 165885199114752. Its totient is φ = 79460354131008.

The previous prime is 121801786400143. The next prime is 121801786400269. The reversal of 121801786400199 is 991004687108121.

It is not a de Polignac number, because 121801786400199 - 2²⁵ = 121801752845767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121801786400299) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70622574 + ... + 72326699.

It is an arithmetic number, because the mean of its divisors is an integer number (10367824944672).

Almost surely, 2^{121801786400199} is an apocalyptic number.

121801786400199 is a deficient number, since it is larger than the sum of its proper divisors (44083412714553).

121801786400199 is a wasteful number, since it uses less digits than its factorization.

121801786400199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142955366.

The product of its (nonzero) digits is 1741824, while the sum is 57.

The spelling of 121801786400199 in words is "one hundred twenty-one trillion, eight hundred one billion, seven hundred eighty-six million, four hundred thousand, one hundred ninety-nine".