1301321220 has 48 divisors (see below), whose sum is σ = 3663860928. Its totient is φ = 345098880.

The previous prime is 1301321213. The next prime is 1301321257. The reversal of 1301321220 is 221231031.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1301321220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49054 + ... + 70773.

It is an arithmetic number, because the mean of its divisors is an integer number (76330436).

Almost surely, 2^1301321220 is an apocalyptic number.

1301321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1301321220 is an abundant number, since it is smaller than the sum of its proper divisors (2362539708).

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

1301321220 is a wasteful number, since it uses less digits than its factorization.

1301321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120020 (or 120018 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1301321220 is about 36073.8301265613. The cubic root of 1301321220 is about 1091.7624937991.

Adding to 1301321220 its reverse (221231031), we get a palindrome (1522552251).

The spelling of 1301321220 in words is "one billion, three hundred one million, three hundred twenty-one thousand, two hundred twenty".