4221511321 has 4 divisors (see below), whose sum is σ = 4301162532. Its totient is φ = 4141860112.

The previous prime is 4221511319. The next prime is 4221511363. The reversal of 4221511321 is 1231151224.

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 2952726921 + 1268784400 = 54339^2 + 35620^2 .

It is not a de Polignac number, because 4221511321 - 2¹ = 4221511319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4221511292 and 4221511301.

It is not an unprimeable number, because it can be changed into a prime (4221511391) 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, 39825526 + ... + 39825631.

It is an arithmetic number, because the mean of its divisors is an integer number (1075290633).

Almost surely, 2^4221511321 is an apocalyptic number.

It is an amenable number.

4221511321 is a deficient number, since it is larger than the sum of its proper divisors (79651211).

4221511321 is an equidigital number, since it uses as much as digits as its factorization.

4221511321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79651210.

The product of its digits is 480, while the sum is 22.

The square root of 4221511321 is about 64973.1584656310. The cubic root of 4221511321 is about 1616.1784790506.

Adding to 4221511321 its reverse (1231151224), we get a palindrome (5452662545).

The spelling of 4221511321 in words is "four billion, two hundred twenty-one million, five hundred eleven thousand, three hundred twenty-one".