21344342234 has 4 divisors (see below), whose sum is σ = 32016513354. Its totient is φ = 10672171116.

The previous prime is 21344342219. The next prime is 21344342251. The reversal of 21344342234 is 43224344312.

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

It can be written as a sum of positive squares in only one way, i.e., 20982391609 + 361950625 = 144853^2 + 19025^2 .

It is a super-3 number, since 3×21344342234³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 21344342234.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5336085557 + ... + 5336085560.

Almost surely, 2^21344342234 is an apocalyptic number.

21344342234 is a deficient number, since it is larger than the sum of its proper divisors (10672171120).

21344342234 is a wasteful number, since it uses less digits than its factorization.

21344342234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10672171119.

The product of its digits is 55296, while the sum is 32.

Adding to 21344342234 its reverse (43224344312), we get a palindrome (64568686546).

The spelling of 21344342234 in words is "twenty-one billion, three hundred forty-four million, three hundred forty-two thousand, two hundred thirty-four".