331121020321220 has 24 divisors (see below), whose sum is σ = 698390623656600. Its totient is φ = 131870030798592.

The previous prime is 331121020321193. The next prime is 331121020321261. The reversal of 331121020321220 is 22123020121133.

It can be written as a sum of positive squares in 4 ways, for example, as 182751031879936 + 148369988441284 = 13518544^2 + 12180722^2 .

It is a super-2 number, since 2×331121020321220² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36148578425 + ... + 36148587584.

It is an arithmetic number, because the mean of its divisors is an integer number (29099609319025).

Almost surely, 2^{331121020321220} is an apocalyptic number.

It is an amenable number.

331121020321220 is an abundant number, since it is smaller than the sum of its proper divisors (367269603335380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

331121020321220 is a wasteful number, since it uses less digits than its factorization.

331121020321220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72297166247 (or 72297166245 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 331121020321220 its reverse (22123020121133), we get a palindrome (353244040442353).

The spelling of 331121020321220 in words is "three hundred thirty-one trillion, one hundred twenty-one billion, twenty million, three hundred twenty-one thousand, two hundred twenty".