321100220220 has 384 divisors, whose sum is σ = 1052696494080. Its totient is φ = 72479784960.

The previous prime is 321100220209. The next prime is 321100220261. The reversal of 321100220220 is 22022001123.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 321100220220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 60616612 + ... + 60621908.

It is an arithmetic number, because the mean of its divisors is an integer number (2741397120).

Almost surely, 2^321100220220 is an apocalyptic number.

321100220220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 321100220220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (526348247040).

321100220220 is an abundant number, since it is smaller than the sum of its proper divisors (731596273860).

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

321100220220 is a wasteful number, since it uses less digits than its factorization.

321100220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5485 (or 5483 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 321100220220 its reverse (22022001123), we get a palindrome (343122221343).

It can be divided in two parts, 321100 and 220220, that added together give a triangular number (541320 = T₁₀₄₀).

The spelling of 321100220220 in words is "three hundred twenty-one billion, one hundred million, two hundred twenty thousand, two hundred twenty".