21212033312 has 24 divisors (see below), whose sum is σ = 41973188796. Its totient is φ = 10552175872.

The previous prime is 21212033287. The next prime is 21212033321. The reversal of 21212033312 is 21333021212.

It can be written as a sum of positive squares in 2 ways, for example, as 15864913936 + 5347119376 = 125956^2 + 73124^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1676123 + ... + 1688730.

Almost surely, 2^21212033312 is an apocalyptic number.

It is an amenable number.

21212033312 is a deficient number, since it is larger than the sum of its proper divisors (20761155484).

21212033312 is a wasteful number, since it uses less digits than its factorization.

21212033312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3365060 (or 3365052 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21212033312 its reverse (21333021212), we get a palindrome (42545054524).

The spelling of 21212033312 in words is "twenty-one billion, two hundred twelve million, thirty-three thousand, three hundred twelve".