21344132443 has 16 divisors (see below), whose sum is σ = 22201973280. Its totient is φ = 20494688256.

The previous prime is 21344132437. The next prime is 21344132449. The reversal of 21344132443 is 34423144312.

It is an interprime number because it is at equal distance from previous prime (21344132437) and next prime (21344132449).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21344132443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344132449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5461096 + ... + 5465002.

It is an arithmetic number, because the mean of its divisors is an integer number (1387623330).

Almost surely, 2^21344132443 is an apocalyptic number.

21344132443 is a deficient number, since it is larger than the sum of its proper divisors (857840837).

21344132443 is a wasteful number, since it uses less digits than its factorization.

21344132443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4926.

The product of its digits is 27648, while the sum is 31.

Adding to 21344132443 its reverse (34423144312), we get a palindrome (55767276755).

The spelling of 21344132443 in words is "twenty-one billion, three hundred forty-four million, one hundred thirty-two thousand, four hundred forty-three".