4720221 has 32 divisors (see below), whose sum is σ = 7971840. Its totient is φ = 2732400.

The previous prime is 4720211. The next prime is 4720223. The reversal of 4720221 is 1220274.

It is not a de Polignac number, because 4720221 - 2¹⁴ = 4703837 is a prime.

It is a Curzon number.

4720221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 4720194 and 4720203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4720223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6486 + ... + 7176.

It is an arithmetic number, because the mean of its divisors is an integer number (249120).

Almost surely, 2^4720221 is an apocalyptic number.

It is an amenable number.

4720221 is a deficient number, since it is larger than the sum of its proper divisors (3251619).

4720221 is a wasteful number, since it uses less digits than its factorization.

4720221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734 (or 728 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 4720221 is about 2172.6069593923. The cubic root of 4720221 is about 167.7467485301.

Adding to 4720221 its reverse (1220274), we get a palindrome (5940495).

The spelling of 4720221 in words is "four million, seven hundred twenty thousand, two hundred twenty-one".