2121434543 has 8 divisors (see below), whose sum is σ = 2139271680. Its totient is φ = 2103615360.

The previous prime is 2121434519. The next prime is 2121434561. The reversal of 2121434543 is 3454341212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2121434543 - 2²² = 2117240239 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121434243) 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 7 ways as a sum of consecutive naturals, for example, 343523 + ... + 349643.

It is an arithmetic number, because the mean of its divisors is an integer number (267408960).

Almost surely, 2^2121434543 is an apocalyptic number.

2121434543 is a deficient number, since it is larger than the sum of its proper divisors (17837137).

2121434543 is a wasteful number, since it uses less digits than its factorization.

2121434543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8977.

The product of its digits is 11520, while the sum is 29.

The square root of 2121434543 is about 46059.0332399628. The cubic root of 2121434543 is about 1284.9213501399.

Adding to 2121434543 its reverse (3454341212), we get a palindrome (5575775755).

The spelling of 2121434543 in words is "two billion, one hundred twenty-one million, four hundred thirty-four thousand, five hundred forty-three".