21102332443 has 4 divisors (see below), whose sum is σ = 21319882360. Its totient is φ = 20884782528.

The previous prime is 21102332437. The next prime is 21102332533. The reversal of 21102332443 is 34423320112.

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 21102332443 - 2⁵ = 21102332411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102332413) 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, 108774813 + ... + 108775006.

It is an arithmetic number, because the mean of its divisors is an integer number (5329970590).

Almost surely, 2^21102332443 is an apocalyptic number.

21102332443 is a deficient number, since it is larger than the sum of its proper divisors (217549917).

21102332443 is an equidigital number, since it uses as much as digits as its factorization.

21102332443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217549916.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21102332443 its reverse (34423320112), we get a palindrome (55525652555).

The spelling of 21102332443 in words is "twenty-one billion, one hundred two million, three hundred thirty-two thousand, four hundred forty-three".