4321242221 has 4 divisors (see below), whose sum is σ = 4325777532. Its totient is φ = 4316706912.

The previous prime is 4321242217. The next prime is 4321242229. The reversal of 4321242221 is 1222421234.

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 1016716996 + 3304525225 = 31886^2 + 57485^2 .

It is a cyclic number.

It is not a de Polignac number, because 4321242221 - 2² = 4321242217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4321242229) 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, 2266226 + ... + 2268131.

It is an arithmetic number, because the mean of its divisors is an integer number (1081444383).

Almost surely, 2^4321242221 is an apocalyptic number.

It is an amenable number.

4321242221 is a deficient number, since it is larger than the sum of its proper divisors (4535311).

4321242221 is an equidigital number, since it uses as much as digits as its factorization.

4321242221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535310.

The product of its digits is 1536, while the sum is 23.

The square root of 4321242221 is about 65736.1561167064. The cubic root of 4321242221 is about 1628.8066617819.

Adding to 4321242221 its reverse (1222421234), we get a palindrome (5543663455).

The spelling of 4321242221 in words is "four billion, three hundred twenty-one million, two hundred forty-two thousand, two hundred twenty-one".