21312032312 has 16 divisors (see below), whose sum is σ = 40810275360. Its totient is φ = 10429292224.

The previous prime is 21312032257. The next prime is 21312032317. The reversal of 21312032312 is 21323021312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312032317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28340093 + ... + 28340844.

It is an arithmetic number, because the mean of its divisors is an integer number (2550642210).

Almost surely, 2^21312032312 is an apocalyptic number.

It is an amenable number.

21312032312 is a deficient number, since it is larger than the sum of its proper divisors (19498243048).

21312032312 is a wasteful number, since it uses less digits than its factorization.

21312032312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56680990 (or 56680986 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21312032312 its reverse (21323021312), we get a palindrome (42635053624).

The spelling of 21312032312 in words is "twenty-one billion, three hundred twelve million, thirty-two thousand, three hundred twelve".