4513221 has 12 divisors (see below), whose sum is σ = 6802848. Its totient is φ = 2877864.

The previous prime is 4513213. The next prime is 4513247. The reversal of 4513221 is 1223154.

It is not a de Polignac number, because 4513221 - 2³ = 4513213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4513194 and 4513203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4513021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10695 + ... + 11108.

It is an arithmetic number, because the mean of its divisors is an integer number (566904).

Almost surely, 2^4513221 is an apocalyptic number.

It is an amenable number.

4513221 is a deficient number, since it is larger than the sum of its proper divisors (2289627).

4513221 is a wasteful number, since it uses less digits than its factorization.

4513221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21832 (or 21829 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 4513221 is about 2124.4342776372. The cubic root of 4513221 is about 165.2578887307.

Adding to 4513221 its reverse (1223154), we get a palindrome (5736375).

The spelling of 4513221 in words is "four million, five hundred thirteen thousand, two hundred twenty-one".