4721321 has 4 divisors (see below), whose sum is σ = 5150544. Its totient is φ = 4292100.

The previous prime is 4721303. The next prime is 4721323. The reversal of 4721321 is 1231274.

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 not a de Polignac number, because 4721321 - 2¹⁰ = 4720297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4721293 and 4721302.

It is not an unprimeable number, because it can be changed into a prime (4721323) 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, 214595 + ... + 214616.

It is an arithmetic number, because the mean of its divisors is an integer number (1287636).

Almost surely, 2^4721321 is an apocalyptic number.

It is an amenable number.

4721321 is a deficient number, since it is larger than the sum of its proper divisors (429223).

4721321 is a wasteful number, since it uses less digits than its factorization.

4721321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429222.

The product of its digits is 336, while the sum is 20.

The square root of 4721321 is about 2172.8600967389. The cubic root of 4721321 is about 167.7597780819.

Adding to 4721321 its reverse (1231274), we get a palindrome (5952595).

The spelling of 4721321 in words is "four million, seven hundred twenty-one thousand, three hundred twenty-one".