21204310304343 has 4 divisors (see below), whose sum is σ = 28272413739128. Its totient is φ = 14136206869560.

The previous prime is 21204310304269. The next prime is 21204310304357. The reversal of 21204310304343 is 34340301340212.

It is a happy number.

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

It is not a de Polignac number, because 21204310304343 - 2⁸ = 21204310304087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21204310304343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204310304363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3534051717388 + ... + 3534051717393.

It is an arithmetic number, because the mean of its divisors is an integer number (7068103434782).

Almost surely, 2^{21204310304343} is an apocalyptic number.

21204310304343 is a deficient number, since it is larger than the sum of its proper divisors (7068103434785).

21204310304343 is an equidigital number, since it uses as much as digits as its factorization.

21204310304343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7068103434784.

The product of its (nonzero) digits is 20736, while the sum is 30.

Adding to 21204310304343 its reverse (34340301340212), we get a palindrome (55544611644555).

The spelling of 21204310304343 in words is "twenty-one trillion, two hundred four billion, three hundred ten million, three hundred four thousand, three hundred forty-three".