21330022012 has 36 divisors (see below), whose sum is σ = 41082459096. Its totient is φ = 9683219520.

The previous prime is 21330021991. The next prime is 21330022013. The reversal of 21330022012 is 21022003312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330022013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 217398 + ... + 299869.

Almost surely, 2^21330022012 is an apocalyptic number.

It is an amenable number.

21330022012 is a deficient number, since it is larger than the sum of its proper divisors (19752437084).

21330022012 is a wasteful number, since it uses less digits than its factorization.

21330022012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517358 (or 517343 counting only the distinct ones).

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

Adding to 21330022012 its reverse (21022003312), we get a palindrome (42352025324).

The spelling of 21330022012 in words is "twenty-one billion, three hundred thirty million, twenty-two thousand, twelve".