1321302220 has 120 divisors (see below), whose sum is σ = 3399135264. Its totient is φ = 422596608.

The previous prime is 1321302217. The next prime is 1321302221. The reversal of 1321302220 is 222031231.

It is a junction number, because it is equal to n+sod(n) for n = 1321302194 and 1321302203.

It is not an unprimeable number, because it can be changed into a prime (1321302221) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11692884 + ... + 11692996.

Almost surely, 2^1321302220 is an apocalyptic number.

1321302220 is a gapful number since it is divisible by the number (10) 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 1321302220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1699567632).

1321302220 is an abundant number, since it is smaller than the sum of its proper divisors (2077833044).

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

1321302220 is an equidigital number, since it uses as much as digits as its factorization.

1321302220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 144 counting only the distinct ones).

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

The square root of 1321302220 is about 36349.7210443216. The cubic root of 1321302220 is about 1097.3219204530.

Adding to 1321302220 its reverse (222031231), we get a palindrome (1543333451).

The spelling of 1321302220 in words is "one billion, three hundred twenty-one million, three hundred two thousand, two hundred twenty".