1321000322220 has 96 divisors (see below), whose sum is σ = 4242352343040. Its totient is φ = 340903304640.

The previous prime is 1321000322143. The next prime is 1321000322227. The reversal of 1321000322220 is 222230001231.

1321000322220 is a `hidden beast` number, since 1 + 321 + 0 + 0 + 0 + 322 + 2 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1321000322193 and 1321000322202.

It is not an unprimeable number, because it can be changed into a prime (1321000322227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39439662 + ... + 39473141.

It is an arithmetic number, because the mean of its divisors is an integer number (44191170240).

Almost surely, 2^{1321000322220} is an apocalyptic number.

1321000322220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321000322220 is an abundant number, since it is smaller than the sum of its proper divisors (2921352020820).

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

1321000322220 is a wasteful number, since it uses less digits than its factorization.

1321000322220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78912852 (or 78912844 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 1321000322220 its reverse (222230001231), we get a palindrome (1543230323451).

The spelling of 1321000322220 in words is "one trillion, three hundred twenty-one billion, three hundred twenty-two thousand, two hundred twenty".