1321134220 has 96 divisors (see below), whose sum is σ = 3350430720. Its totient is φ = 427472640.

The previous prime is 1321134197. The next prime is 1321134229. The reversal of 1321134220 is 224311231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (1321134229) 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, 826462 + ... + 828058.

It is an arithmetic number, because the mean of its divisors is an integer number (34900320).

Almost surely, 2^1321134220 is an apocalyptic number.

1321134220 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 1321134220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1675215360).

1321134220 is an abundant number, since it is smaller than the sum of its proper divisors (2029296500).

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

1321134220 is a wasteful number, since it uses less digits than its factorization.

1321134220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943 (or 1941 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1321134220 is about 36347.4100865522. The cubic root of 1321134220 is about 1097.2754113113.

Adding to 1321134220 its reverse (224311231), we get a palindrome (1545445451).

The spelling of 1321134220 in words is "one billion, three hundred twenty-one million, one hundred thirty-four thousand, two hundred twenty".