231321320012 has 6 divisors (see below), whose sum is σ = 404812310028. Its totient is φ = 115660660004.

The previous prime is 231321320003. The next prime is 231321320033. The reversal of 231321320012 is 210023123132.

It is a super-2 number, since 2×231321320012² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28915164998 + ... + 28915165005.

It is an arithmetic number, because the mean of its divisors is an integer number (67468718338).

Almost surely, 2^231321320012 is an apocalyptic number.

It is an amenable number.

231321320012 is a deficient number, since it is larger than the sum of its proper divisors (173490990016).

231321320012 is a wasteful number, since it uses less digits than its factorization.

231321320012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57830330007 (or 57830330005 counting only the distinct ones).

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

Adding to 231321320012 its reverse (210023123132), we get a palindrome (441344443144).

The spelling of 231321320012 in words is "two hundred thirty-one billion, three hundred twenty-one million, three hundred twenty thousand, twelve".