231240103220 has 216 divisors, whose sum is σ = 580597131744. Its totient is φ = 77119039872.

The previous prime is 231240103207. The next prime is 231240103229. The reversal of 231240103220 is 22301042132.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 231240103192 and 231240103201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231240103229) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1418650859 + ... + 1418651021.

It is an arithmetic number, because the mean of its divisors is an integer number (2687949684).

Almost surely, 2^231240103220 is an apocalyptic number.

231240103220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231240103220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290298565872).

231240103220 is an abundant number, since it is smaller than the sum of its proper divisors (349357028524).

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

231240103220 is a wasteful number, since it uses less digits than its factorization.

231240103220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539 (or 367 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 231240103220 its reverse (22301042132), we get a palindrome (253541145352).

The spelling of 231240103220 in words is "two hundred thirty-one billion, two hundred forty million, one hundred three thousand, two hundred twenty".