331220220221 has 16 divisors (see below), whose sum is σ = 366362813376. Its totient is φ = 296940000000.

The previous prime is 331220220209. The next prime is 331220220241. The reversal of 331220220221 is 122022022133.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-331220220221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 331220220193 and 331220220202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331220220241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315020 + ... + 872741.

It is an arithmetic number, because the mean of its divisors is an integer number (22897675836).

Almost surely, 2^331220220221 is an apocalyptic number.

It is an amenable number.

331220220221 is a deficient number, since it is larger than the sum of its proper divisors (35142593155).

331220220221 is a wasteful number, since it uses less digits than its factorization.

331220220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188124.

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

Adding to 331220220221 its reverse (122022022133), we get a palindrome (453242242354).

The spelling of 331220220221 in words is "three hundred thirty-one billion, two hundred twenty million, two hundred twenty thousand, two hundred twenty-one".