1844332112221 has 4 divisors (see below), whose sum is σ = 1860653635452. Its totient is φ = 1828010588992.

The previous prime is 1844332112213. The next prime is 1844332112239. The reversal of 1844332112221 is 1222112334481.

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 207698036121 + 1636634076100 = 455739^2 + 1279310^2 .

It is a cyclic number.

It is not a de Polignac number, because 1844332112221 - 2³ = 1844332112213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1844332112621) 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, 8160761446 + ... + 8160761671.

It is an arithmetic number, because the mean of its divisors is an integer number (465163408863).

Almost surely, 2^{1844332112221} is an apocalyptic number.

It is an amenable number.

1844332112221 is a deficient number, since it is larger than the sum of its proper divisors (16321523231).

1844332112221 is a wasteful number, since it uses less digits than its factorization.

1844332112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16321523230.

The product of its digits is 18432, while the sum is 34.

The spelling of 1844332112221 in words is "one trillion, eight hundred forty-four billion, three hundred thirty-two million, one hundred twelve thousand, two hundred twenty-one".