231030320013221 has 12 divisors (see below), whose sum is σ = 236809787662500. Its totient is φ = 225388632821760.

The previous prime is 231030320013179. The next prime is 231030320013223. The reversal of 231030320013221 is 122310023030132.

It can be written as a sum of positive squares in 6 ways, for example, as 162527566876900 + 68502753136321 = 12748630^2 + 8276639^2 .

It is not a de Polignac number, because 231030320013221 - 2¹⁰ = 231030320012197 is a prime.

It is a super-2 number, since 2×231030320013221² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231030320013223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54103655 + ... + 58217403.

It is an arithmetic number, because the mean of its divisors is an integer number (19734148971875).

Almost surely, 2^{231030320013221} is an apocalyptic number.

It is an amenable number.

231030320013221 is a deficient number, since it is larger than the sum of its proper divisors (5779467649279).

231030320013221 is an equidigital number, since it uses as much as digits as its factorization.

231030320013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4147240 (or 4147199 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 231030320013221 its reverse (122310023030132), we get a palindrome (353340343043353).

The spelling of 231030320013221 in words is "two hundred thirty-one trillion, thirty billion, three hundred twenty million, thirteen thousand, two hundred twenty-one".