2121344243 has 4 divisors (see below), whose sum is σ = 2232993960. Its totient is φ = 2009694528.

The previous prime is 2121344227. The next prime is 2121344263. The reversal of 2121344243 is 3424431212.

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 2121344243 - 2⁴ = 2121344227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121344213) 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, 55824830 + ... + 55824867.

It is an arithmetic number, because the mean of its divisors is an integer number (558248490).

Almost surely, 2^2121344243 is an apocalyptic number.

2121344243 is a deficient number, since it is larger than the sum of its proper divisors (111649717).

2121344243 is a wasteful number, since it uses less digits than its factorization.

2121344243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111649716.

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

The square root of 2121344243 is about 46058.0529657952. The cubic root of 2121344243 is about 1284.9031187589.

Adding to 2121344243 its reverse (3424431212), we get a palindrome (5545775455).

It can be divided in two parts, 21213 and 44243, that added together give a palindrome (65456).

The spelling of 2121344243 in words is "two billion, one hundred twenty-one million, three hundred forty-four thousand, two hundred forty-three".