11421888161 has 4 divisors (see below), whose sum is σ = 11429601924. Its totient is φ = 11414174400.

The previous prime is 11421888157. The next prime is 11421888169. The reversal of 11421888161 is 16188812411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16188812411 = 17 ⋅952283083.

It can be written as a sum of positive squares in 2 ways, for example, as 7341233761 + 4080654400 = 85681^2 + 63880^2 .

It is a cyclic number.

It is not a de Polignac number, because 11421888161 - 2² = 11421888157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11421888169) 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, 3854660 + ... + 3857621.

It is an arithmetic number, because the mean of its divisors is an integer number (2857400481).

Almost surely, 2^11421888161 is an apocalyptic number.

It is an amenable number.

11421888161 is a deficient number, since it is larger than the sum of its proper divisors (7713763).

11421888161 is an equidigital number, since it uses as much as digits as its factorization.

11421888161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7713762.

The product of its digits is 24576, while the sum is 41.

The spelling of 11421888161 in words is "eleven billion, four hundred twenty-one million, eight hundred eighty-eight thousand, one hundred sixty-one".