231321100231 has 48 divisors (see below), whose sum is σ = 278710546464. Its totient is φ = 190165045248.

The previous prime is 231321100229. The next prime is 231321100291. The reversal of 231321100231 is 132001123132.

It is not a de Polignac number, because 231321100231 - 2¹ = 231321100229 is a prime.

It is a super-2 number, since 2×231321100231² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231321100199 and 231321100208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231321100291) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 123898960 + ... + 123900826.

It is an arithmetic number, because the mean of its divisors is an integer number (5806469718).

Almost surely, 2^231321100231 is an apocalyptic number.

231321100231 is a deficient number, since it is larger than the sum of its proper divisors (47389446233).

231321100231 is a wasteful number, since it uses less digits than its factorization.

231321100231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3488 (or 3469 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 231321100231 its reverse (132001123132), we get a palindrome (363322223363).

The spelling of 231321100231 in words is "two hundred thirty-one billion, three hundred twenty-one million, one hundred thousand, two hundred thirty-one".