331201321 has 24 divisors (see below), whose sum is σ = 377189064. Its totient is φ = 290400000.

The previous prime is 331201313. The next prime is 331201337. The reversal of 331201321 is 123102133.

It can be written as a sum of positive squares in 4 ways, for example, as 93702400 + 237498921 = 9680^2 + 15411^2 .

It is not a de Polignac number, because 331201321 - 2³ = 331201313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331201295 and 331201304.

It is not an unprimeable number, because it can be changed into a prime (331201921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 500731 + ... + 501391.

It is an arithmetic number, because the mean of its divisors is an integer number (15716211).

Almost surely, 2^331201321 is an apocalyptic number.

It is an amenable number.

331201321 is a deficient number, since it is larger than the sum of its proper divisors (45987743).

331201321 is a wasteful number, since it uses less digits than its factorization.

331201321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825 (or 814 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 331201321 is about 18198.9373590878. The cubic root of 331201321 is about 691.8798566579.

Adding to 331201321 its reverse (123102133), we get a palindrome (454303454).

The spelling of 331201321 in words is "three hundred thirty-one million, two hundred one thousand, three hundred twenty-one".