121236918769 has 4 divisors (see below), whose sum is σ = 128368502244. Its totient is φ = 114105335296.

The previous prime is 121236918727. The next prime is 121236918791. The reversal of 121236918769 is 967819632121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63101440000 + 58135478769 = 251200^2 + 241113^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121236918769 is a prime.

It is a super-2 number, since 2×121236918769² (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 (121236918709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3565791712 + ... + 3565791745.

It is an arithmetic number, because the mean of its divisors is an integer number (32092125561).

Almost surely, 2^121236918769 is an apocalyptic number.

It is an amenable number.

121236918769 is a deficient number, since it is larger than the sum of its proper divisors (7131583475).

121236918769 is an equidigital number, since it uses as much as digits as its factorization.

121236918769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7131583474.

The product of its digits is 1959552, while the sum is 55.

The spelling of 121236918769 in words is "one hundred twenty-one billion, two hundred thirty-six million, nine hundred eighteen thousand, seven hundred sixty-nine".