221144112011321 has 4 divisors (see below), whose sum is σ = 224769425323044. Its totient is φ = 217518798699600.

The previous prime is 221144112011309. The next prime is 221144112011323. The reversal of 221144112011321 is 123110211441122.

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 12058874362921 + 209085237648400 = 3472589^2 + 14459780^2 .

It is a cyclic number.

It is not a de Polignac number, because 221144112011321 - 2⁶ = 221144112011257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221144112011323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1812656655770 + ... + 1812656655891.

It is an arithmetic number, because the mean of its divisors is an integer number (56192356330761).

Almost surely, 2^{221144112011321} is an apocalyptic number.

It is an amenable number.

221144112011321 is a deficient number, since it is larger than the sum of its proper divisors (3625313311723).

221144112011321 is an equidigital number, since it uses as much as digits as its factorization.

221144112011321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3625313311722.

The product of its (nonzero) digits is 768, while the sum is 26.

Adding to 221144112011321 its reverse (123110211441122), we get a palindrome (344254323452443).

The spelling of 221144112011321 in words is "two hundred twenty-one trillion, one hundred forty-four billion, one hundred twelve million, eleven thousand, three hundred twenty-one".