2221153220 has 48 divisors (see below), whose sum is σ = 5479887168. Its totient is φ = 745560960.

The previous prime is 2221153169. The next prime is 2221153223. The reversal of 2221153220 is 223511222.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2221153192 and 2221153201.

It is not an unprimeable number, because it can be changed into a prime (2221153223) 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, 385454 + ... + 391173.

It is an arithmetic number, because the mean of its divisors is an integer number (114164316).

Almost surely, 2^2221153220 is an apocalyptic number.

2221153220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221153220 is an abundant number, since it is smaller than the sum of its proper divisors (3258733948).

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

2221153220 is a wasteful number, since it uses less digits than its factorization.

2221153220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776660 (or 776658 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 2221153220 is about 47129.1122343717. The cubic root of 2221153220 is about 1304.7465967169.

Adding to 2221153220 its reverse (223511222), we get a palindrome (2444664442).

The spelling of 2221153220 in words is "two billion, two hundred twenty-one million, one hundred fifty-three thousand, two hundred twenty".