331201220 has 96 divisors (see below), whose sum is σ = 818415360. Its totient is φ = 110246400.

The previous prime is 331201193. The next prime is 331201229. The reversal of 331201220 is 22102133.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 331201195 and 331201204.

It is not an unprimeable number, because it can be changed into a prime (331201229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 834062 + ... + 834458.

It is an arithmetic number, because the mean of its divisors is an integer number (8525160).

Almost surely, 2^331201220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 331201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (409207680).

331201220 is an abundant number, since it is smaller than the sum of its proper divisors (487214140).

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

331201220 is a wasteful number, since it uses less digits than its factorization.

331201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573 (or 571 counting only the distinct ones).

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

The square root of 331201220 is about 18198.9345842003. The cubic root of 331201220 is about 691.8797863282.

Adding to 331201220 its reverse (22102133), we get a palindrome (353303353).

The spelling of 331201220 in words is "three hundred thirty-one million, two hundred one thousand, two hundred twenty".