21343442233 has 4 divisors (see below), whose sum is σ = 21635818228. Its totient is φ = 21051066240.

The previous prime is 21343442209. The next prime is 21343442269. The reversal of 21343442233 is 33224434312.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13614922489 + 7728519744 = 116683^2 + 87912^2 .

It is a cyclic number.

It is not a de Polignac number, because 21343442233 - 2¹³ = 21343434041 is a prime.

It is a super-3 number, since 3×21343442233³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21343442195 and 21343442204.

It is not an unprimeable number, because it can be changed into a prime (21343442293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146187888 + ... + 146188033.

It is an arithmetic number, because the mean of its divisors is an integer number (5408954557).

Almost surely, 2^21343442233 is an apocalyptic number.

It is an amenable number.

21343442233 is a deficient number, since it is larger than the sum of its proper divisors (292375995).

21343442233 is an equidigital number, since it uses as much as digits as its factorization.

21343442233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292375994.

The product of its digits is 41472, while the sum is 31.

Adding to 21343442233 its reverse (33224434312), we get a palindrome (54567876545).

The spelling of 21343442233 in words is "twenty-one billion, three hundred forty-three million, four hundred forty-two thousand, two hundred thirty-three".