4013221321 has 4 divisors (see below), whose sum is σ = 4088942532. Its totient is φ = 3937500112.

The previous prime is 4013221307. The next prime is 4013221339. The reversal of 4013221321 is 1231223104.

It is a happy number.

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 2825454025 + 1187767296 = 53155^2 + 34464^2 .

It is a cyclic number.

It is not a de Polignac number, because 4013221321 - 2¹³ = 4013213129 is a prime.

It is a super-2 number, since 2×4013221321² = 32211890742657970082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4013221361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37860526 + ... + 37860631.

It is an arithmetic number, because the mean of its divisors is an integer number (1022235633).

Almost surely, 2^4013221321 is an apocalyptic number.

It is an amenable number.

4013221321 is a deficient number, since it is larger than the sum of its proper divisors (75721211).

4013221321 is an equidigital number, since it uses as much as digits as its factorization.

4013221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75721210.

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

The square root of 4013221321 is about 63349.9906945534. The cubic root of 4013221321 is about 1589.1480901057.

Adding to 4013221321 its reverse (1231223104), we get a palindrome (5244444425).

The spelling of 4013221321 in words is "four billion, thirteen million, two hundred twenty-one thousand, three hundred twenty-one".