4228521 has 16 divisors (see below), whose sum is σ = 6218688. Its totient is φ = 2534400.

The previous prime is 4228513. The next prime is 4228531. The reversal of 4228521 is 1258224.

It is not a de Polignac number, because 4228521 - 2³ = 4228513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4228491 and 4228500.

It is not an unprimeable number, because it can be changed into a prime (4228501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2541 + ... + 3861.

It is an arithmetic number, because the mean of its divisors is an integer number (388668).

Almost surely, 2^4228521 is an apocalyptic number.

It is an amenable number.

4228521 is a deficient number, since it is larger than the sum of its proper divisors (1990167).

4228521 is a wasteful number, since it uses less digits than its factorization.

4228521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432.

The product of its digits is 1280, while the sum is 24.

The square root of 4228521 is about 2056.3367914814. The cubic root of 4228521 is about 161.7072521243.

The spelling of 4228521 in words is "four million, two hundred twenty-eight thousand, five hundred twenty-one".