231220122 has 48 divisors (see below), whose sum is σ = 539511840. Its totient is φ = 65870112.

The previous prime is 231220097. The next prime is 231220153. The reversal of 231220122 is 221022132.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 122248 + ... + 124124.

It is an arithmetic number, because the mean of its divisors is an integer number (11239830).

Almost surely, 2^231220122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231220122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269755920).

231220122 is an abundant number, since it is smaller than the sum of its proper divisors (308291718).

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

231220122 is a wasteful number, since it uses less digits than its factorization.

231220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315 (or 2308 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 231220122 is about 15205.9239114235. The cubic root of 231220122 is about 613.7740771730.

Adding to 231220122 its reverse (221022132), we get a palindrome (452242254).

The spelling of 231220122 in words is "two hundred thirty-one million, two hundred twenty thousand, one hundred twenty-two".