21443330212 has 12 divisors (see below), whose sum is σ = 37526888140. Its totient is φ = 10721362176.

The previous prime is 21443330203. The next prime is 21443330219. The reversal of 21443330212 is 21203334412.

It can be written as a sum of positive squares in 2 ways, for example, as 11147981056 + 10295349156 = 105584^2 + 101466^2 .

It is not an unprimeable number, because it can be changed into a prime (21443330219) 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, 177964 + ... + 273052.

Almost surely, 2^21443330212 is an apocalyptic number.

It is an amenable number.

21443330212 is a deficient number, since it is larger than the sum of its proper divisors (16083557928).

21443330212 is a wasteful number, since it uses less digits than its factorization.

21443330212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151470 (or 151468 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21443330212 its reverse (21203334412), we get a palindrome (42646664624).

The spelling of 21443330212 in words is "twenty-one billion, four hundred forty-three million, three hundred thirty thousand, two hundred twelve".