21312311132 has 48 divisors (see below), whose sum is σ = 43333059840. Its totient is φ = 8982496512.

The previous prime is 21312311123. The next prime is 21312311161. The reversal of 21312311132 is 23111321312.

It is a happy number.

It is a super-2 number, since 2×21312311132² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1152068 + ... + 1170420.

It is an arithmetic number, because the mean of its divisors is an integer number (902772080).

Almost surely, 2^21312311132 is an apocalyptic number.

It is an amenable number.

21312311132 is an abundant number, since it is smaller than the sum of its proper divisors (22020748708).

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

21312311132 is a wasteful number, since it uses less digits than its factorization.

21312311132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19050 (or 19048 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

Adding to 21312311132 its reverse (23111321312), we get a palindrome (44423632444).

The spelling of 21312311132 in words is "twenty-one billion, three hundred twelve million, three hundred eleven thousand, one hundred thirty-two".