4224721 has 8 divisors (see below), whose sum is σ = 4501224. Its totient is φ = 3951360.

The previous prime is 4224719. The next prime is 4224733. The reversal of 4224721 is 1274224.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1113025 + 3111696 = 1055^2 + 1764^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4224721 - 2¹ = 4224719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4224692 and 4224701.

It is not an unprimeable number, because it can be changed into a prime (4224761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2391 + ... + 3763.

It is an arithmetic number, because the mean of its divisors is an integer number (562653).

Almost surely, 2^4224721 is an apocalyptic number.

It is an amenable number.

4224721 is a deficient number, since it is larger than the sum of its proper divisors (276503).

4224721 is a wasteful number, since it uses less digits than its factorization.

4224721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571.

The product of its digits is 896, while the sum is 22.

The square root of 4224721 is about 2055.4126106454. The cubic root of 4224721 is about 161.6587976945.

Adding to 4224721 its reverse (1274224), we get a palindrome (5498945).

The spelling of 4224721 in words is "four million, two hundred twenty-four thousand, seven hundred twenty-one".