21432222443 has 4 divisors (see below), whose sum is σ = 21466959240. Its totient is φ = 21397485648.

The previous prime is 21432222419. The next prime is 21432222517. The reversal of 21432222443 is 34422223412.

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 21432222443 - 2⁸ = 21432222187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21432225443) 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, 17367473 + ... + 17368706.

It is an arithmetic number, because the mean of its divisors is an integer number (5366739810).

Almost surely, 2^21432222443 is an apocalyptic number.

21432222443 is a deficient number, since it is larger than the sum of its proper divisors (34736797).

21432222443 is an equidigital number, since it uses as much as digits as its factorization.

21432222443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34736796.

The product of its digits is 18432, while the sum is 29.

Adding to 21432222443 its reverse (34422223412), we get a palindrome (55854445855).

The spelling of 21432222443 in words is "twenty-one billion, four hundred thirty-two million, two hundred twenty-two thousand, four hundred forty-three".