2131223443 has 4 divisors (see below), whose sum is σ = 2133460728. Its totient is φ = 2128986160.

The previous prime is 2131223389. The next prime is 2131223473. The reversal of 2131223443 is 3443221312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2131223443 - 2⁹ = 2131222931 is a prime.

It is a super-2 number, since 2×2131223443² = 9084226727985548498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131223473) 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, 1117213 + ... + 1119118.

It is an arithmetic number, because the mean of its divisors is an integer number (533365182).

Almost surely, 2^2131223443 is an apocalyptic number.

2131223443 is a deficient number, since it is larger than the sum of its proper divisors (2237285).

2131223443 is an equidigital number, since it uses as much as digits as its factorization.

2131223443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2237284.

The product of its digits is 3456, while the sum is 25.

The square root of 2131223443 is about 46165.1756522165. The cubic root of 2131223443 is about 1286.8946485049.

Adding to 2131223443 its reverse (3443221312), we get a palindrome (5574444755).

The spelling of 2131223443 in words is "two billion, one hundred thirty-one million, two hundred twenty-three thousand, four hundred forty-three".