4320221 has 4 divisors (see below), whose sum is σ = 4332000.
Its totient is φ = 4308444.
The previous prime is 4320187. The next prime is 4320223. The reversal of 4320221 is 1220234.
Adding to 4320221 its reverse (1220234), we get a palindrome (5540455).
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.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-4320221 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 4320196 and 4320205.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (4320223) 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, 5321 + ... + 6078.
It is an arithmetic number, because the mean of its divisors is an integer number (1083000).
Almost surely, 24320221 is an apocalyptic number.
It is an amenable number.
4320221 is a deficient number, since it is larger than the sum of its proper divisors (11779).
4320221 is a wasteful number, since it uses less digits than its factorization.
4320221 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 11778.
The product of its (nonzero) digits is 96, while the sum is 14.
The square root of 4320221 is about 2078.5141327400.
The cubic root of 4320221 is about 162.8678341997.
The spelling of 4320221 in words is "four million, three hundred twenty thousand, two hundred twenty-one".