231003001220 has 12 divisors (see below), whose sum is σ = 485106302604. Its totient is φ = 92401200480.

The previous prime is 231003001189. The next prime is 231003001279. The reversal of 231003001220 is 22100300132.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 82081104004 + 148921897216 = 286498^2 + 385904^2 .

It is a junction number, because it is equal to n+sod(n) for n = 231003001195 and 231003001204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5775075011 + ... + 5775075050.

It is an arithmetic number, because the mean of its divisors is an integer number (40425525217).

Almost surely, 2^231003001220 is an apocalyptic number.

231003001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231003001220 is an abundant number, since it is smaller than the sum of its proper divisors (254103301384).

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

231003001220 is a wasteful number, since it uses less digits than its factorization.

231003001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11550150070 (or 11550150068 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 231003001220 its reverse (22100300132), we get a palindrome (253103301352).

The spelling of 231003001220 in words is "two hundred thirty-one billion, three million, one thousand, two hundred twenty".