231210220 has 24 divisors (see below), whose sum is σ = 485843904. Its totient is φ = 92426496.

The previous prime is 231210197. The next prime is 231210223. The reversal of 231210220 is 22012132.

It is a self number, because there is not a number n which added to its sum of digits gives 231210220.

It is not an unprimeable number, because it can be changed into a prime (231210223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45949 + ... + 50731.

It is an arithmetic number, because the mean of its divisors is an integer number (20243496).

Almost surely, 2^231210220 is an apocalyptic number.

231210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231210220 is an abundant number, since it is smaller than the sum of its proper divisors (254633684).

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

231210220 is a wasteful number, since it uses less digits than its factorization.

231210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7209 (or 7207 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 231210220 is about 15205.5983111484. The cubic root of 231210220 is about 613.7653154245.

Adding to 231210220 its reverse (22012132), we get a palindrome (253222352).

The spelling of 231210220 in words is "two hundred thirty-one million, two hundred ten thousand, two hundred twenty".