21312113223200 has 144 divisors (see below), whose sum is σ = 54704727798336. Its totient is φ = 8091953126400.

The previous prime is 21312113223173. The next prime is 21312113223251. The reversal of 21312113223200 is 232231121312.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2010467 + ... + 6831266.

It is an arithmetic number, because the mean of its divisors is an integer number (379893943044).

Almost surely, 2^{21312113223200} is an apocalyptic number.

21312113223200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312113223200 is an abundant number, since it is smaller than the sum of its proper divisors (33392614575136).

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

21312113223200 is a wasteful number, since it uses less digits than its factorization.

21312113223200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8841907 (or 8841894 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21312113223200 its reverse (232231121312), we get a palindrome (21544344344512).

The spelling of 21312113223200 in words is "twenty-one trillion, three hundred twelve billion, one hundred thirteen million, two hundred twenty-three thousand, two hundred".