21330020212 has 12 divisors (see below), whose sum is σ = 37574738656. Its totient is φ = 10594380600.

The previous prime is 21330020203. The next prime is 21330020213. The reversal of 21330020212 is 21202003312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330020213) 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, 17656698 + ... + 17657905.

Almost surely, 2^21330020212 is an apocalyptic number.

It is an amenable number.

21330020212 is a deficient number, since it is larger than the sum of its proper divisors (16244718444).

21330020212 is a wasteful number, since it uses less digits than its factorization.

21330020212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35314758 (or 35314756 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21330020212 its reverse (21202003312), we get a palindrome (42532023524).

The spelling of 21330020212 in words is "twenty-one billion, three hundred thirty million, twenty thousand, two hundred twelve".