21234032443 has 4 divisors (see below), whose sum is σ = 22867419568. Its totient is φ = 19600645320.

The previous prime is 21234032431. The next prime is 21234032497. The reversal of 21234032443 is 34423043212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21234032443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234032543) 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, 816693543 + ... + 816693568.

It is an arithmetic number, because the mean of its divisors is an integer number (5716854892).

Almost surely, 2^21234032443 is an apocalyptic number.

21234032443 is a deficient number, since it is larger than the sum of its proper divisors (1633387125).

21234032443 is a wasteful number, since it uses less digits than its factorization.

21234032443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633387124.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 21234032443 its reverse (34423043212), we get a palindrome (55657075655).

The spelling of 21234032443 in words is "twenty-one billion, two hundred thirty-four million, thirty-two thousand, four hundred forty-three".