21231323312 has 40 divisors (see below), whose sum is σ = 41679028800. Its totient is φ = 10475592192.

The previous prime is 21231323303. The next prime is 21231323317. The reversal of 21231323312 is 21332313212.

It is not an unprimeable number, because it can be changed into a prime (21231323317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3228764 + ... + 3235332.

It is an arithmetic number, because the mean of its divisors is an integer number (1041975720).

Almost surely, 2^21231323312 is an apocalyptic number.

It is an amenable number.

21231323312 is a deficient number, since it is larger than the sum of its proper divisors (20447705488).

21231323312 is a wasteful number, since it uses less digits than its factorization.

21231323312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9213 (or 9207 counting only the distinct ones).

The product of its digits is 1296, while the sum is 23.

Adding to 21231323312 its reverse (21332313212), we get a palindrome (42563636524).

The spelling of 21231323312 in words is "twenty-one billion, two hundred thirty-one million, three hundred twenty-three thousand, three hundred twelve".