121517956219 has 16 divisors (see below), whose sum is σ = 136164153600. Its totient is φ = 107472324960.

The previous prime is 121517956199. The next prime is 121517956247. The reversal of 121517956219 is 912659715121.

It is not a de Polignac number, because 121517956219 - 2⁵ = 121517956187 is a prime.

It is a super-2 number, since 2×121517956219² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121517956279) 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, 5442252 + ... + 5464534.

It is an arithmetic number, because the mean of its divisors is an integer number (8510259600).

Almost surely, 2^121517956219 is an apocalyptic number.

121517956219 is a deficient number, since it is larger than the sum of its proper divisors (14646197381).

121517956219 is a wasteful number, since it uses less digits than its factorization.

121517956219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35730.

The product of its digits is 340200, while the sum is 49.

The spelling of 121517956219 in words is "one hundred twenty-one billion, five hundred seventeen million, nine hundred fifty-six thousand, two hundred nineteen".