4420521 has 32 divisors (see below), whose sum is σ = 7884800. Its totient is φ = 2391120.

The previous prime is 4420519. The next prime is 4420523. The reversal of 4420521 is 1250244.

4420521 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (4420519) and next prime (4420523).

It is not a de Polignac number, because 4420521 - 2¹ = 4420519 is a prime.

It is a super-2 number, since 2×4420521² = 39082011822882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4420494 and 4420503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4420523) 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, 2976 + ... + 4206.

It is an arithmetic number, because the mean of its divisors is an integer number (246400).

Almost surely, 2^4420521 is an apocalyptic number.

It is an amenable number.

4420521 is a deficient number, since it is larger than the sum of its proper divisors (3464279).

4420521 is a wasteful number, since it uses less digits than its factorization.

4420521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266 (or 1260 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 4420521 is about 2102.5035077260. The cubic root of 4420521 is about 164.1186059536.

Adding to 4420521 its reverse (1250244), we get a palindrome (5670765).

The spelling of 4420521 in words is "four million, four hundred twenty thousand, five hundred twenty-one".