21343442113 has 4 divisors (see below), whose sum is σ = 24392505280.
Its totient is φ = 18294378948.
The previous prime is 21343442111. The next prime is 21343442129. The reversal of 21343442113 is 31124434312.
Adding to 21343442113 its reverse (31124434312), we get a palindrome (52467876425).
It is a happy number.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 21343442113 - 21 = 21343442111 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (21343442111) 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, 1524531573 + ... + 1524531586.
It is an arithmetic number, because the mean of its divisors is an integer number (6098126320).
Almost surely, 221343442113 is an apocalyptic number.
It is an amenable number.
21343442113 is a deficient number, since it is larger than the sum of its proper divisors (3049063167).
21343442113 is an equidigital number, since it uses as much as digits as its factorization.
21343442113 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3049063166.
The product of its digits is 6912, while the sum is 28.
The spelling of 21343442113 in words is "twenty-one billion, three hundred forty-three million, four hundred forty-two thousand, one hundred thirteen".