1321112220320 has 24 divisors (see below), whose sum is σ = 3121127620884. Its totient is φ = 528444888064.

The previous prime is 1321112220269. The next prime is 1321112220353. The reversal of 1321112220320 is 230222111231.

It can be written as a sum of positive squares in 2 ways, for example, as 1088792076304 + 232320144016 = 1043452^2 + 481996^2 .

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 = 1321112220292 and 1321112220301.

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, 4128475529 + ... + 4128475848.

Almost surely, 2^{1321112220320} is an apocalyptic number.

1321112220320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321112220320 is an abundant number, since it is smaller than the sum of its proper divisors (1800015400564).

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

1321112220320 is an equidigital number, since it uses as much as digits as its factorization.

1321112220320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8256951392 (or 8256951384 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1321112220320 its reverse (230222111231), we get a palindrome (1551334331551).

The spelling of 1321112220320 in words is "one trillion, three hundred twenty-one billion, one hundred twelve million, two hundred twenty thousand, three hundred twenty".