4421321321 has 4 divisors (see below), whose sum is σ = 4504742532. Its totient is φ = 4337900112.

The previous prime is 4421321309. The next prime is 4421321323. The reversal of 4421321321 is 1231231244.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3774382096 + 646939225 = 61436^2 + 25435^2 .

It is a cyclic number.

It is not a de Polignac number, because 4421321321 - 2¹⁰ = 4421320297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4421321323) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 41710526 + ... + 41710631.

It is an arithmetic number, because the mean of its divisors is an integer number (1126185633).

Almost surely, 2^4421321321 is an apocalyptic number.

It is an amenable number.

4421321321 is a deficient number, since it is larger than the sum of its proper divisors (83421211).

4421321321 is an equidigital number, since it uses as much as digits as its factorization.

4421321321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83421210.

The product of its digits is 1152, while the sum is 23.

The square root of 4421321321 is about 66493.0170845029. The cubic root of 4421321321 is about 1641.2850973651.

Adding to 4421321321 its reverse (1231231244), we get a palindrome (5652552565).

The spelling of 4421321321 in words is "four billion, four hundred twenty-one million, three hundred twenty-one thousand, three hundred twenty-one".