21231344234 has 8 divisors (see below), whose sum is σ = 33720370308. Its totient is φ = 9991220800.

The previous prime is 21231344231. The next prime is 21231344261. The reversal of 21231344234 is 43244313212.

It can be written as a sum of positive squares in 2 ways, for example, as 19369680625 + 1861663609 = 139175^2 + 43147^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21231344197 and 21231344206.

It is not an unprimeable number, because it can be changed into a prime (21231344231) 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, 312225617 + ... + 312225684.

Almost surely, 2^21231344234 is an apocalyptic number.

21231344234 is a deficient number, since it is larger than the sum of its proper divisors (12489026074).

21231344234 is a wasteful number, since it uses less digits than its factorization.

21231344234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624451320.

The product of its digits is 13824, while the sum is 29.

Adding to 21231344234 its reverse (43244313212), we get a palindrome (64475657446).

The spelling of 21231344234 in words is "twenty-one billion, two hundred thirty-one million, three hundred forty-four thousand, two hundred thirty-four".