12221443543 has 4 divisors (see below), whose sum is σ = 12376145440. Its totient is φ = 12066741648.

The previous prime is 12221443541. The next prime is 12221443561. The reversal of 12221443543 is 34534412221.

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 12221443543 - 2¹ = 12221443541 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 (12221443541) 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, 77350830 + ... + 77350987.

It is an arithmetic number, because the mean of its divisors is an integer number (3094036360).

Almost surely, 2^12221443543 is an apocalyptic number.

12221443543 is a deficient number, since it is larger than the sum of its proper divisors (154701897).

12221443543 is an equidigital number, since it uses as much as digits as its factorization.

12221443543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154701896.

The product of its digits is 23040, while the sum is 31.

Adding to 12221443543 its reverse (34534412221), we get a palindrome (46755855764).

The spelling of 12221443543 in words is "twelve billion, two hundred twenty-one million, four hundred forty-three thousand, five hundred forty-three".