331220210100020 has 12 divisors (see below), whose sum is σ = 695562441210084. Its totient is φ = 132488084040000.

The previous prime is 331220210099993. The next prime is 331220210100029. The reversal of 331220210100020 is 20001012022133.

It can be written as a sum of positive squares in 2 ways, for example, as 182293040540836 + 148927169559184 = 13501594^2 + 12203572^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331220210100029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8280505252481 + ... + 8280505252520.

It is an arithmetic number, because the mean of its divisors is an integer number (57963536767507).

Almost surely, 2^{331220210100020} is an apocalyptic number.

It is an amenable number.

331220210100020 is an abundant number, since it is smaller than the sum of its proper divisors (364342231110064).

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

331220210100020 is a wasteful number, since it uses less digits than its factorization.

331220210100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16561010505010 (or 16561010505008 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 331220210100020 its reverse (20001012022133), we get a palindrome (351221222122153).

The spelling of 331220210100020 in words is "three hundred thirty-one trillion, two hundred twenty billion, two hundred ten million, one hundred thousand, twenty".