21341223443 has 4 divisors (see below), whose sum is σ = 21343915488. Its totient is φ = 21338531400.

The previous prime is 21341223437. The next prime is 21341223457. The reversal of 21341223443 is 34432214312.

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 21341223443 - 2⁴ = 21341223427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21341223433) 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, 1334096 + ... + 1349997.

It is an arithmetic number, because the mean of its divisors is an integer number (5335978872).

Almost surely, 2^21341223443 is an apocalyptic number.

21341223443 is a deficient number, since it is larger than the sum of its proper divisors (2692045).

21341223443 is an equidigital number, since it uses as much as digits as its factorization.

21341223443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692044.

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

Adding to 21341223443 its reverse (34432214312), we get a palindrome (55773437755).

The spelling of 21341223443 in words is "twenty-one billion, three hundred forty-one million, two hundred twenty-three thousand, four hundred forty-three".