21233340343 has 2 divisors, whose sum is σ = 21233340344. Its totient is φ = 21233340342.

The previous prime is 21233340341. The next prime is 21233340347. The reversal of 21233340343 is 34304333212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21233340343 - 2¹ = 21233340341 is a prime.

Together with 21233340341, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233340341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616670171 + 10616670172.

It is an arithmetic number, because the mean of its divisors is an integer number (10616670172).

Almost surely, 2^21233340343 is an apocalyptic number.

21233340343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233340343 is an equidigital number, since it uses as much as digits as its factorization.

21233340343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 28.

Adding to 21233340343 its reverse (34304333212), we get a palindrome (55537673555).

The spelling of 21233340343 in words is "twenty-one billion, two hundred thirty-three million, three hundred forty thousand, three hundred forty-three".