21234422343 has 4 divisors (see below), whose sum is σ = 28312563128. Its totient is φ = 14156281560.

The previous prime is 21234422323. The next prime is 21234422351. The reversal of 21234422343 is 34322443212.

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

It is not a de Polignac number, because 21234422343 - 2¹⁷ = 21234291271 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 21234422343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234422323) 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, 3539070388 + ... + 3539070393.

It is an arithmetic number, because the mean of its divisors is an integer number (7078140782).

Almost surely, 2^21234422343 is an apocalyptic number.

21234422343 is a deficient number, since it is larger than the sum of its proper divisors (7078140785).

21234422343 is an equidigital number, since it uses as much as digits as its factorization.

21234422343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7078140784.

The product of its digits is 27648, while the sum is 30.

Adding to 21234422343 its reverse (34322443212), we get a palindrome (55556865555).

The spelling of 21234422343 in words is "twenty-one billion, two hundred thirty-four million, four hundred twenty-two thousand, three hundred forty-three".