331100221 has 4 divisors (see below), whose sum is σ = 342517500. Its totient is φ = 319682944.

The previous prime is 331100173. The next prime is 331100227. The reversal of 331100221 is 122001133.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 134792100 + 196308121 = 11610^2 + 14011^2 .

It is a cyclic number.

It is not a de Polignac number, because 331100221 - 2⁹ = 331099709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331100227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5708596 + ... + 5708653.

It is an arithmetic number, because the mean of its divisors is an integer number (85629375).

Almost surely, 2^331100221 is an apocalyptic number.

It is an amenable number.

331100221 is a deficient number, since it is larger than the sum of its proper divisors (11417279).

331100221 is a wasteful number, since it uses less digits than its factorization.

331100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11417278.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 331100221 is about 18196.1595123806. The cubic root of 331100221 is about 691.8094501633.

Adding to 331100221 its reverse (122001133), we get a palindrome (453101354).

The spelling of 331100221 in words is "three hundred thirty-one million, one hundred thousand, two hundred twenty-one".