21213324131443 has 4 divisors (see below), whose sum is σ = 21944818067040. Its totient is φ = 20481830195848.

The previous prime is 21213324131401. The next prime is 21213324131479. The reversal of 21213324131443 is 34413142331212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21213324131443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213324131399 and 21213324131408.

It is not an unprimeable number, because it can be changed into a prime (21213324131243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365746967755 + ... + 365746967812.

It is an arithmetic number, because the mean of its divisors is an integer number (5486204516760).

Almost surely, 2^{21213324131443} is an apocalyptic number.

21213324131443 is a deficient number, since it is larger than the sum of its proper divisors (731493935597).

21213324131443 is an equidigital number, since it uses as much as digits as its factorization.

21213324131443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731493935596.

The product of its digits is 41472, while the sum is 34.

Adding to 21213324131443 its reverse (34413142331212), we get a palindrome (55626466462655).

The spelling of 21213324131443 in words is "twenty-one trillion, two hundred thirteen billion, three hundred twenty-four million, one hundred thirty-one thousand, four hundred forty-three".