21223313212 has 12 divisors (see below), whose sum is σ = 37142304976. Its totient is φ = 10611226080.

The previous prime is 21223313197. The next prime is 21223313219. The reversal of 21223313212 is 21231332212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223313219) 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, 20137 + ... + 207007.

Almost surely, 2^21223313212 is an apocalyptic number.

It is an amenable number.

21223313212 is a deficient number, since it is larger than the sum of its proper divisors (15918991764).

21223313212 is a wasteful number, since it uses less digits than its factorization.

21223313212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215268 (or 215266 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

Adding to 21223313212 its reverse (21231332212), we get a palindrome (42454645424).

The spelling of 21223313212 in words is "twenty-one billion, two hundred twenty-three million, three hundred thirteen thousand, two hundred twelve".