231231321321 has 128 divisors (see below), whose sum is σ = 419349934080. Its totient is φ = 109442534400.

The previous prime is 231231321313. The next prime is 231231321337. The reversal of 231231321321 is 123123132132.

It is not a de Polignac number, because 231231321321 - 2³ = 231231321313 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231231321291 and 231231321300.

It is not an unprimeable number, because it can be changed into a prime (231231322321) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 95905606 + ... + 95908016.

It is an arithmetic number, because the mean of its divisors is an integer number (3276171360).

Almost surely, 2^231231321321 is an apocalyptic number.

231231321321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

231231321321 is a deficient number, since it is larger than the sum of its proper divisors (188118612759).

231231321321 is a wasteful number, since it uses less digits than its factorization.

231231321321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2847.

The product of its digits is 1296, while the sum is 24.

Adding to 231231321321 its reverse (123123132132), we get a palindrome (354354453453).

The spelling of 231231321321 in words is "two hundred thirty-one billion, two hundred thirty-one million, three hundred twenty-one thousand, three hundred twenty-one".