21443143223 has 4 divisors (see below), whose sum is σ = 21443913288. Its totient is φ = 21442373160.

The previous prime is 21443143201. The next prime is 21443143229. The reversal of 21443143223 is 32234134412.

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 21443143223 - 2¹⁰ = 21443142199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443143229) 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, 341633 + ... + 399498.

It is an arithmetic number, because the mean of its divisors is an integer number (5360978322).

Almost surely, 2^21443143223 is an apocalyptic number.

21443143223 is a deficient number, since it is larger than the sum of its proper divisors (770065).

21443143223 is an equidigital number, since it uses as much as digits as its factorization.

21443143223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770064.

The product of its digits is 13824, while the sum is 29.

Adding to 21443143223 its reverse (32234134412), we get a palindrome (53677277635).

The spelling of 21443143223 in words is "twenty-one billion, four hundred forty-three million, one hundred forty-three thousand, two hundred twenty-three".