4521220 has 24 divisors (see below), whose sum is σ = 10358208. Its totient is φ = 1644000.

The previous prime is 4521217. The next prime is 4521241. The reversal of 4521220 is 221254.

It is a junction number, because it is equal to n+sod(n) for n = 4521194 and 4521203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10056 + ... + 10495.

It is an arithmetic number, because the mean of its divisors is an integer number (431592).

Almost surely, 2^4521220 is an apocalyptic number.

It is an amenable number.

4521220 is an abundant number, since it is smaller than the sum of its proper divisors (5836988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4521220 is a wasteful number, since it uses less digits than its factorization.

4521220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20571 (or 20569 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 4521220 is about 2126.3160630537. The cubic root of 4521220 is about 165.3554626264.

Adding to 4521220 its reverse (221254), we get a palindrome (4742474).

The spelling of 4521220 in words is "four million, five hundred twenty-one thousand, two hundred twenty".