331310221 has 12 divisors (see below), whose sum is σ = 364615776. Its totient is φ = 300820520.

The previous prime is 331310209. The next prime is 331310233. The reversal of 331310221 is 122013133.

It is an interprime number because it is at equal distance from previous prime (331310209) and next prime (331310233).

It is a de Polignac number, because none of the positive numbers 2^k-331310221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331310195 and 331310204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331310821) 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 11 ways as a sum of consecutive naturals, for example, 164406 + ... + 166408.

It is an arithmetic number, because the mean of its divisors is an integer number (30384648).

Almost surely, 2^331310221 is an apocalyptic number.

It is an amenable number.

331310221 is a deficient number, since it is larger than the sum of its proper divisors (33305555).

331310221 is a wasteful number, since it uses less digits than its factorization.

331310221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3392 (or 3381 counting only the distinct ones).

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

The square root of 331310221 is about 18201.9290461204. The cubic root of 331310221 is about 691.9556790808.

Adding to 331310221 its reverse (122013133), we get a palindrome (453323354).

The spelling of 331310221 in words is "three hundred thirty-one million, three hundred ten thousand, two hundred twenty-one".