21434211343 has 4 divisors (see below), whose sum is σ = 21434910840. Its totient is φ = 21433511848.

The previous prime is 21434211341. The next prime is 21434211361. The reversal of 21434211343 is 34311243412.

It is a happy number.

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 21434211343 - 2¹ = 21434211341 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 (21434211341) 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, 301573 + ... + 365806.

It is an arithmetic number, because the mean of its divisors is an integer number (5358727710).

Almost surely, 2^21434211343 is an apocalyptic number.

21434211343 is a deficient number, since it is larger than the sum of its proper divisors (699497).

21434211343 is an equidigital number, since it uses as much as digits as its factorization.

21434211343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699496.

The product of its digits is 6912, while the sum is 28.

Adding to 21434211343 its reverse (34311243412), we get a palindrome (55745454755).

The spelling of 21434211343 in words is "twenty-one billion, four hundred thirty-four million, two hundred eleven thousand, three hundred forty-three".