231331230303220 has 24 divisors (see below), whose sum is σ = 485831092988808. Its totient is φ = 92525728435200.

The previous prime is 231331230303197. The next prime is 231331230303221. The reversal of 231331230303220 is 22303032133132.

It can be written as a sum of positive squares in 4 ways, for example, as 113210068160484 + 118121162142736 = 10640022^2 + 10868356^2 .

It is a super-2 number, since 2×231331230303220² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231331230303221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422449921 + ... + 422997160.

It is an arithmetic number, because the mean of its divisors is an integer number (20242962207867).

Almost surely, 2^{231331230303220} is an apocalyptic number.

231331230303220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231331230303220 is an abundant number, since it is smaller than the sum of its proper divisors (254499862685588).

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

231331230303220 is a wasteful number, since it uses less digits than its factorization.

231331230303220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845460771 (or 845460769 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 28.

Adding to 231331230303220 its reverse (22303032133132), we get a palindrome (253634262436352).

The spelling of 231331230303220 in words is "two hundred thirty-one trillion, three hundred thirty-one billion, two hundred thirty million, three hundred three thousand, two hundred twenty".