21312300012 has 24 divisors (see below), whose sum is σ = 50885182656. Its totient is φ = 6938888208.

The previous prime is 21312300007. The next prime is 21312300049. The reversal of 21312300012 is 21000321312.

It is a junction number, because it is equal to n+sod(n) for n = 21312299964 and 21312300000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20650938 + ... + 20651969.

It is an arithmetic number, because the mean of its divisors is an integer number (2120215944).

Almost surely, 2^21312300012 is an apocalyptic number.

It is an amenable number.

21312300012 is an abundant number, since it is smaller than the sum of its proper divisors (29572882644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21312300012 is a wasteful number, since it uses less digits than its factorization.

21312300012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41302957 (or 41302955 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21312300012 its reverse (21000321312), we get a palindrome (42312621324).

The spelling of 21312300012 in words is "twenty-one billion, three hundred twelve million, three hundred thousand, twelve".