21033223312 has 10 divisors (see below), whose sum is σ = 40751870198. Its totient is φ = 10516611648.

The previous prime is 21033223297. The next prime is 21033223313. The reversal of 21033223312 is 21332233012.

It can be written as a sum of positive squares in only one way, i.e., 20948509696 + 84713616 = 144736^2 + 9204^2 .

It is not an unprimeable number, because it can be changed into a prime (21033223313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657288213 + ... + 657288244.

Almost surely, 2^21033223312 is an apocalyptic number.

It is an amenable number.

21033223312 is a deficient number, since it is larger than the sum of its proper divisors (19718646886).

21033223312 is a wasteful number, since it uses less digits than its factorization.

21033223312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1314576465 (or 1314576459 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21033223312 its reverse (21332233012), we get a palindrome (42365456324).

The spelling of 21033223312 in words is "twenty-one billion, thirty-three million, two hundred twenty-three thousand, three hundred twelve".