121785172469 has 8 divisors (see below), whose sum is σ = 122132684928. Its totient is φ = 121437745920.

The previous prime is 121785172463. The next prime is 121785172507. The reversal of 121785172469 is 964271587121.

It is a happy number.

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 121785172469 - 2²⁰ = 121784123893 is a prime.

It is a super-2 number, since 2×121785172469² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121785172469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121785172463) 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, 3751829 + ... + 3784149.

It is an arithmetic number, because the mean of its divisors is an integer number (15266585616).

Almost surely, 2^121785172469 is an apocalyptic number.

It is an amenable number.

121785172469 is a deficient number, since it is larger than the sum of its proper divisors (347512459).

121785172469 is a wasteful number, since it uses less digits than its factorization.

121785172469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42955.

The product of its digits is 1693440, while the sum is 53.

The spelling of 121785172469 in words is "one hundred twenty-one billion, seven hundred eighty-five million, one hundred seventy-two thousand, four hundred sixty-nine".