2013621220 has 48 divisors (see below), whose sum is σ = 4560313968. Its totient is φ = 742440960.

The previous prime is 2013621193. The next prime is 2013621223. The reversal of 2013621220 is 221263102.

It can be written as a sum of positive squares in 8 ways, for example, as 555450624 + 1458170596 = 23568^2 + 38186^2 .

It is not an unprimeable number, because it can be changed into a prime (2013621223) 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, 192772 + ... + 202948.

It is an arithmetic number, because the mean of its divisors is an integer number (95006541).

Almost surely, 2^2013621220 is an apocalyptic number.

2013621220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2013621220 is an abundant number, since it is smaller than the sum of its proper divisors (2546692748).

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

2013621220 is a wasteful number, since it uses less digits than its factorization.

2013621220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10960 (or 10958 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2013621220 is about 44873.3910017953. The cubic root of 2013621220 is about 1262.7748579097.

Adding to 2013621220 its reverse (221263102), we get a palindrome (2234884322).

The spelling of 2013621220 in words is "two billion, thirteen million, six hundred twenty-one thousand, two hundred twenty".