320121003220 has 12 divisors (see below), whose sum is σ = 672254106804. Its totient is φ = 128048401280.

The previous prime is 320121003211. The next prime is 320121003253. The reversal of 320121003220 is 22300121023.

It can be written as a sum of positive squares in 2 ways, for example, as 103847640516 + 216273362704 = 322254^2 + 465052^2 .

It is a junction number, because it is equal to n+sod(n) for n = 320121003194 and 320121003203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8003025061 + ... + 8003025100.

It is an arithmetic number, because the mean of its divisors is an integer number (56021175567).

Almost surely, 2^320121003220 is an apocalyptic number.

It is an amenable number.

320121003220 is an abundant number, since it is smaller than the sum of its proper divisors (352133103584).

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

320121003220 is a wasteful number, since it uses less digits than its factorization.

320121003220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16006050170 (or 16006050168 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 320121003220 its reverse (22300121023), we get a palindrome (342421124243).

The spelling of 320121003220 in words is "three hundred twenty billion, one hundred twenty-one million, three thousand, two hundred twenty".