21234043343 has 4 divisors (see below), whose sum is σ = 21533114448. Its totient is φ = 20934972240.

The previous prime is 21234043283. The next prime is 21234043357. The reversal of 21234043343 is 34334043212.

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

It is a cyclic number.

It is not a de Polignac number, because 21234043343 - 2²⁰ = 21232994767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234063343) 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, 149535446 + ... + 149535587.

It is an arithmetic number, because the mean of its divisors is an integer number (5383278612).

Almost surely, 2^21234043343 is an apocalyptic number.

21234043343 is a deficient number, since it is larger than the sum of its proper divisors (299071105).

21234043343 is an equidigital number, since it uses as much as digits as its factorization.

21234043343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299071104.

The product of its (nonzero) digits is 20736, while the sum is 29.

Adding to 21234043343 its reverse (34334043212), we get a palindrome (55568086555).

The spelling of 21234043343 in words is "twenty-one billion, two hundred thirty-four million, forty-three thousand, three hundred forty-three".