4021220 has 24 divisors (see below), whose sum is σ = 9651264. Its totient is φ = 1378656.

The previous prime is 4021211. The next prime is 4021229. The reversal of 4021220 is 221204.

4021220 is digitally balanced in base 5, 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 (4021211) and next prime (4021229).

It is not an unprimeable number, because it can be changed into a prime (4021229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14222 + ... + 14501.

It is an arithmetic number, because the mean of its divisors is an integer number (402136).

Almost surely, 2^4021220 is an apocalyptic number.

It is an amenable number.

4021220 is an abundant number, since it is smaller than the sum of its proper divisors (5630044).

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

4021220 is a wasteful number, since it uses less digits than its factorization.

4021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28739 (or 28737 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 4021220 is about 2005.2979828444. The cubic root of 4021220 is about 159.0203156932.

Adding to 4021220 its reverse (221204), we get a palindrome (4242424).

The spelling of 4021220 in words is "four million, twenty-one thousand, two hundred twenty".