21330333212 has 12 divisors (see below), whose sum is σ = 37391678520. Its totient is φ = 10646996496.

The previous prime is 21330333181. The next prime is 21330333217. The reversal of 21330333212 is 21233303312.

It is a super-2 number, since 2×21330333212² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330333217) 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, 4539887 + ... + 4544582.

It is an arithmetic number, because the mean of its divisors is an integer number (3115973210).

Almost surely, 2^21330333212 is an apocalyptic number.

It is an amenable number.

21330333212 is a deficient number, since it is larger than the sum of its proper divisors (16061345308).

21330333212 is a wasteful number, since it uses less digits than its factorization.

21330333212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9085060 (or 9085058 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21330333212 its reverse (21233303312), we get a palindrome (42563636524).

The spelling of 21330333212 in words is "twenty-one billion, three hundred thirty million, three hundred thirty-three thousand, two hundred twelve".