2121443243 has 32 divisors (see below), whose sum is σ = 2382815232. Its totient is φ = 1879488000.

The previous prime is 2121443239. The next prime is 2121443257. The reversal of 2121443243 is 3423441212.

It is a cyclic number.

It is not a de Polignac number, because 2121443243 - 2² = 2121443239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121443843) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4217330 + ... + 4217832.

It is an arithmetic number, because the mean of its divisors is an integer number (74462976).

Almost surely, 2^2121443243 is an apocalyptic number.

2121443243 is a deficient number, since it is larger than the sum of its proper divisors (261371989).

2121443243 is a wasteful number, since it uses less digits than its factorization.

2121443243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755.

The product of its digits is 4608, while the sum is 26.

The square root of 2121443243 is about 46059.1276838804. The cubic root of 2121443243 is about 1284.9231066244.

Adding to 2121443243 its reverse (3423441212), we get a palindrome (5544884455).

The spelling of 2121443243 in words is "two billion, one hundred twenty-one million, four hundred forty-three thousand, two hundred forty-three".