21344243212 has 12 divisors (see below), whose sum is σ = 37417165240. Its totient is φ = 10653624576.

The previous prime is 21344243203. The next prime is 21344243213. The reversal of 21344243212 is 21234244312.

It is not an unprimeable number, because it can be changed into a prime (21344243213) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 4621662 + ... + 4626277.

Almost surely, 2^21344243212 is an apocalyptic number.

It is an amenable number.

21344243212 is a deficient number, since it is larger than the sum of its proper divisors (16072922028).

21344243212 is a wasteful number, since it uses less digits than its factorization.

21344243212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9248520 (or 9248518 counting only the distinct ones).

The product of its digits is 9216, while the sum is 28.

Adding to 21344243212 its reverse (21234244312), we get a palindrome (42578487524).

The spelling of 21344243212 in words is "twenty-one billion, three hundred forty-four million, two hundred forty-three thousand, two hundred twelve".