21432110243 has 2 divisors, whose sum is σ = 21432110244. Its totient is φ = 21432110242.

The previous prime is 21432110237. The next prime is 21432110261. The reversal of 21432110243 is 34201123412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21432110243 - 2²⁰ = 21431061667 is a prime.

It is not a weakly prime, because it can be changed into another prime (21432119243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716055121 + 10716055122.

It is an arithmetic number, because the mean of its divisors is an integer number (10716055122).

Almost surely, 2^21432110243 is an apocalyptic number.

21432110243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432110243 is an equidigital number, since it uses as much as digits as its factorization.

21432110243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21432110243 its reverse (34201123412), we get a palindrome (55633233655).

The spelling of 21432110243 in words is "twenty-one billion, four hundred thirty-two million, one hundred ten thousand, two hundred forty-three".