331424221 has 2 divisors, whose sum is σ = 331424222. Its totient is φ = 331424220.

The previous prime is 331424189. The next prime is 331424257. The reversal of 331424221 is 122424133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182925625 + 148498596 = 13525^2 + 12186^2 .

It is a cyclic number.

It is not a de Polignac number, because 331424221 - 2⁵ = 331424189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 331424192 and 331424201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331424321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165712110 + 165712111.

It is an arithmetic number, because the mean of its divisors is an integer number (165712111).

Almost surely, 2^331424221 is an apocalyptic number.

It is an amenable number.

331424221 is a deficient number, since it is larger than the sum of its proper divisors (1).

331424221 is an equidigital number, since it uses as much as digits as its factorization.

331424221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 22.

The square root of 331424221 is about 18205.0603130009. The cubic root of 331424221 is about 692.0350346179.

Adding to 331424221 its reverse (122424133), we get a palindrome (453848354).

The spelling of 331424221 in words is "three hundred thirty-one million, four hundred twenty-four thousand, two hundred twenty-one".