2121244043 has 4 divisors (see below), whose sum is σ = 2137946880. Its totient is φ = 2104541208.

The previous prime is 2121244039. The next prime is 2121244057. The reversal of 2121244043 is 3404421212.

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 2121244043 - 2² = 2121244039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121244033) 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, 8351228 + ... + 8351481.

It is an arithmetic number, because the mean of its divisors is an integer number (534486720).

Almost surely, 2^2121244043 is an apocalyptic number.

2121244043 is a deficient number, since it is larger than the sum of its proper divisors (16702837).

2121244043 is a wasteful number, since it uses less digits than its factorization.

2121244043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16702836.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 2121244043 is about 46056.9651952883. The cubic root of 2121244043 is about 1284.8828879830.

Adding to 2121244043 its reverse (3404421212), we get a palindrome (5525665255).

The spelling of 2121244043 in words is "two billion, one hundred twenty-one million, two hundred forty-four thousand, forty-three".