331242221 has 4 divisors (see below), whose sum is σ = 331299744. Its totient is φ = 331184700.

The previous prime is 331242217. The next prime is 331242227. The reversal of 331242221 is 122242133.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 331242221 - 2² = 331242217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331242193 and 331242202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331242227) 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 3 ways as a sum of consecutive naturals, for example, 19025 + ... + 32006.

It is an arithmetic number, because the mean of its divisors is an integer number (82824936).

Almost surely, 2^331242221 is an apocalyptic number.

It is an amenable number.

331242221 is a deficient number, since it is larger than the sum of its proper divisors (57523).

331242221 is an equidigital number, since it uses as much as digits as its factorization.

331242221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57522.

The product of its digits is 576, while the sum is 20.

The square root of 331242221 is about 18200.0610163812. The cubic root of 331242221 is about 691.9083355312.

Adding to 331242221 its reverse (122242133), we get a palindrome (453484354).

The spelling of 331242221 in words is "three hundred thirty-one million, two hundred forty-two thousand, two hundred twenty-one".