231321100320 has 96 divisors (see below), whose sum is σ = 809623866240. Its totient is φ = 61685625600.

The previous prime is 231321100319. The next prime is 231321100327. The reversal of 231321100320 is 23001123132.

231321100320 is a `hidden beast` number, since 2 + 313 + 21 + 10 + 0 + 320 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 231321100293 and 231321100302.

It is not an unprimeable number, because it can be changed into a prime (231321100327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26768956 + ... + 26777595.

It is an arithmetic number, because the mean of its divisors is an integer number (8433581940).

Almost surely, 2^231321100320 is an apocalyptic number.

231321100320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231321100320 is an abundant number, since it is smaller than the sum of its proper divisors (578302765920).

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

231321100320 is a wasteful number, since it uses less digits than its factorization.

231321100320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53546575 (or 53546561 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 231321100320 its reverse (23001123132), we get a palindrome (254322223452).

The spelling of 231321100320 in words is "two hundred thirty-one billion, three hundred twenty-one million, one hundred thousand, three hundred twenty".