105843843221 has 4 divisors (see below), whose sum is σ = 110445749472. Its totient is φ = 101241936972.

The previous prime is 105843843187. The next prime is 105843843251. The reversal of 105843843221 is 122348348501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105843843221 is a prime.

It is a super-2 number, since 2×105843843221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105843843251) 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, 2300953091 + ... + 2300953136.

It is an arithmetic number, because the mean of its divisors is an integer number (27611437368).

Almost surely, 2^105843843221 is an apocalyptic number.

It is an amenable number.

105843843221 is a deficient number, since it is larger than the sum of its proper divisors (4601906251).

105843843221 is an equidigital number, since it uses as much as digits as its factorization.

105843843221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4601906250.

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 105843843221 in words is "one hundred five billion, eight hundred forty-three million, eight hundred forty-three thousand, two hundred twenty-one".