2221133220 has 72 divisors (see below), whose sum is σ = 6847921080. Its totient is φ = 582589440.

The previous prime is 2221133219. The next prime is 2221133237. The reversal of 2221133220 is 223311222.

It can be written as a sum of positive squares in 4 ways, for example, as 91126116 + 2130007104 = 9546^2 + 46152^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2221133193 and 2221133202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90165 + ... + 112124.

It is an arithmetic number, because the mean of its divisors is an integer number (95110015).

Almost surely, 2^2221133220 is an apocalyptic number.

2221133220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221133220 is an abundant number, since it is smaller than the sum of its proper divisors (4626787860).

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

2221133220 is a wasteful number, since it uses less digits than its factorization.

2221133220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202365 (or 202360 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2221133220 is about 47128.9000508181. The cubic root of 2221133220 is about 1304.7426805815.

Adding to 2221133220 its reverse (223311222), we get a palindrome (2444444442).

The spelling of 2221133220 in words is "two billion, two hundred twenty-one million, one hundred thirty-three thousand, two hundred twenty".