331221231020 has 24 divisors (see below), whose sum is σ = 696725820000. Its totient is φ = 132267304832.

The previous prime is 331221231013. The next prime is 331221231037. The reversal of 331221231020 is 20132122133.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 331221230983 and 331221231001.

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, 13811945 + ... + 13835904.

It is an arithmetic number, because the mean of its divisors is an integer number (29030242500).

Almost surely, 2^331221231020 is an apocalyptic number.

It is an amenable number.

331221231020 is an abundant number, since it is smaller than the sum of its proper divisors (365504588980).

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

331221231020 is a wasteful number, since it uses less digits than its factorization.

331221231020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27648457 (or 27648455 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 331221231020 its reverse (20132122133), we get a palindrome (351353353153).

The spelling of 331221231020 in words is "three hundred thirty-one billion, two hundred twenty-one million, two hundred thirty-one thousand, twenty".