1321220230220 has 48 divisors (see below), whose sum is σ = 3026988921600. Its totient is φ = 480413008320.

The previous prime is 1321220230177. The next prime is 1321220230229. The reversal of 1321220230220 is 220320221231.

It is a happy number.

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 = 1321220230192 and 1321220230201.

It is not an unprimeable number, because it can be changed into a prime (1321220230229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3410801 + ... + 3778359.

It is an arithmetic number, because the mean of its divisors is an integer number (63062269200).

Almost surely, 2^{1321220230220} is an apocalyptic number.

1321220230220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321220230220 is an abundant number, since it is smaller than the sum of its proper divisors (1705768691380).

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

1321220230220 is a wasteful number, since it uses less digits than its factorization.

1321220230220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383918 (or 383916 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 1321220230220 its reverse (220320221231), we get a palindrome (1541540451451).

The spelling of 1321220230220 in words is "one trillion, three hundred twenty-one billion, two hundred twenty million, two hundred thirty thousand, two hundred twenty".