331022221 has 2 divisors, whose sum is σ = 331022222. Its totient is φ = 331022220.

The previous prime is 331022203. The next prime is 331022231. The reversal of 331022221 is 122220133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 168740100 + 162282121 = 12990^2 + 12739^2 .

It is a cyclic number.

It is not a de Polignac number, because 331022221 - 2⁵ = 331022189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 331022195 and 331022204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331022201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165511110 + 165511111.

It is an arithmetic number, because the mean of its divisors is an integer number (165511111).

Almost surely, 2^331022221 is an apocalyptic number.

It is an amenable number.

331022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

331022221 is an equidigital number, since it uses as much as digits as its factorization.

331022221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 331022221 is about 18194.0160767215. The cubic root of 331022221 is about 691.7551208176.

Adding to 331022221 its reverse (122220133), we get a palindrome (453242354).

The spelling of 331022221 in words is "three hundred thirty-one million, twenty-two thousand, two hundred twenty-one".