121145520199 has 16 divisors (see below), whose sum is σ = 136730293920. Its totient is φ = 106323468160.

The previous prime is 121145520131. The next prime is 121145520203. The reversal of 121145520199 is 991025541121.

It is a cyclic number.

It is not a de Polignac number, because 121145520199 - 2³³ = 112555585607 is a prime.

It is a super-3 number, since 3×121145520199³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121145320199) 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 15 ways as a sum of consecutive naturals, for example, 5019549 + ... + 5043625.

It is an arithmetic number, because the mean of its divisors is an integer number (8545643370).

Almost surely, 2^121145520199 is an apocalyptic number.

121145520199 is a deficient number, since it is larger than the sum of its proper divisors (15584773721).

121145520199 is a wasteful number, since it uses less digits than its factorization.

121145520199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39890.

The product of its (nonzero) digits is 32400, while the sum is 40.

The spelling of 121145520199 in words is "one hundred twenty-one billion, one hundred forty-five million, five hundred twenty thousand, one hundred ninety-nine".