1013221321 has 4 divisors (see below), whose sum is σ = 1157967232. Its totient is φ = 868475412.

The previous prime is 1013221289. The next prime is 1013221331. The reversal of 1013221321 is 1231223101.

1013221321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1231223101 = 29 ⋅42455969.

It is not a de Polignac number, because 1013221321 - 2⁵ = 1013221289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1013221295 and 1013221304.

It is not an unprimeable number, because it can be changed into a prime (1013221331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72372945 + ... + 72372958.

It is an arithmetic number, because the mean of its divisors is an integer number (289491808).

Almost surely, 2^1013221321 is an apocalyptic number.

It is an amenable number.

1013221321 is a deficient number, since it is larger than the sum of its proper divisors (144745911).

1013221321 is an equidigital number, since it uses as much as digits as its factorization.

1013221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144745910.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1013221321 is about 31831.1376014116. The cubic root of 1013221321 is about 1004.3878258249.

Adding to 1013221321 its reverse (1231223101), we get a palindrome (2244444422).

The spelling of 1013221321 in words is "one billion, thirteen million, two hundred twenty-one thousand, three hundred twenty-one".