121595840509 has 8 divisors (see below), whose sum is σ = 142853854752. Its totient is φ = 102038467440.

The previous prime is 121595840503. The next prime is 121595840519. The reversal of 121595840509 is 905048595121.

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

It is not a de Polignac number, because 121595840509 - 2¹³ = 121595832317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121595840503) 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, 425160139 + ... + 425160424.

It is an arithmetic number, because the mean of its divisors is an integer number (17856731844).

Almost surely, 2^121595840509 is an apocalyptic number.

It is an amenable number.

121595840509 is a deficient number, since it is larger than the sum of its proper divisors (21258014243).

121595840509 is a wasteful number, since it uses less digits than its factorization.

121595840509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850320587.

The product of its (nonzero) digits is 648000, while the sum is 49.

The spelling of 121595840509 in words is "one hundred twenty-one billion, five hundred ninety-five million, eight hundred forty thousand, five hundred nine".