121771334161 has 4 divisors (see below), whose sum is σ = 121855142452. Its totient is φ = 121687525872.

The previous prime is 121771334131. The next prime is 121771334183. The reversal of 121771334161 is 161433177121.

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 79512720400 + 42258613761 = 281980^2 + 205569^2 .

It is a cyclic number.

It is not a de Polignac number, because 121771334161 - 2³⁵ = 87411595793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121771334161.

It is not an unprimeable number, because it can be changed into a prime (121771334131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41901966 + ... + 41904871.

It is an arithmetic number, because the mean of its divisors is an integer number (30463785613).

Almost surely, 2^121771334161 is an apocalyptic number.

It is an amenable number.

121771334161 is a deficient number, since it is larger than the sum of its proper divisors (83808291).

121771334161 is an equidigital number, since it uses as much as digits as its factorization.

121771334161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83808290.

The product of its digits is 21168, while the sum is 37.

The spelling of 121771334161 in words is "one hundred twenty-one billion, seven hundred seventy-one million, three hundred thirty-four thousand, one hundred sixty-one".