21320111212 has 12 divisors (see below), whose sum is σ = 37314790576. Its totient is φ = 10658742480.

The previous prime is 21320111171. The next prime is 21320111227. The reversal of 21320111212 is 21211102312.

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, 291288 + ... + 357055.

Almost surely, 2^21320111212 is an apocalyptic number.

It is an amenable number.

21320111212 is a deficient number, since it is larger than the sum of its proper divisors (15994679364).

21320111212 is a wasteful number, since it uses less digits than its factorization.

21320111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656568 (or 656566 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21320111212 its reverse (21211102312), we get a palindrome (42531213524).

The spelling of 21320111212 in words is "twenty-one billion, three hundred twenty million, one hundred eleven thousand, two hundred twelve".