21312323300 has 72 divisors (see below), whose sum is σ = 49386005760. Its totient is φ = 7965417600.

The previous prime is 21312323261. The next prime is 21312323311. The reversal of 21312323300 is 332321312.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28634 + ... + 208433.

Almost surely, 2^21312323300 is an apocalyptic number.

21312323300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312323300 is an abundant number, since it is smaller than the sum of its proper divisors (28073682460).

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

21312323300 is a wasteful number, since it uses less digits than its factorization.

21312323300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237141 (or 237134 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21312323300 its reverse (332321312), we get a palindrome (21644644612).

The spelling of 21312323300 in words is "twenty-one billion, three hundred twelve million, three hundred twenty-three thousand, three hundred".