2013021220 has 48 divisors (see below), whose sum is σ = 4838037120. Its totient is φ = 689209344.

The previous prime is 2013021191. The next prime is 2013021229. The reversal of 2013021220 is 221203102.

It is a self number, because there is not a number n which added to its sum of digits gives 2013021220.

It is not an unprimeable number, because it can be changed into a prime (2013021229) 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, 93732 + ... + 113188.

It is an arithmetic number, because the mean of its divisors is an integer number (100792440).

Almost surely, 2^2013021220 is an apocalyptic number.

2013021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2013021220 is an abundant number, since it is smaller than the sum of its proper divisors (2825015900).

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

2013021220 is a wasteful number, since it uses less digits than its factorization.

2013021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20212 (or 20210 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 2013021220 is about 44866.7050272248. The cubic root of 2013021220 is about 1262.6494221734.

Adding to 2013021220 its reverse (221203102), we get a palindrome (2234224322).

The spelling of 2013021220 in words is "two billion, thirteen million, twenty-one thousand, two hundred twenty".