2221101220 has 48 divisors (see below), whose sum is σ = 5029291008. Its totient is φ = 819089280.

The previous prime is 2221101217. The next prime is 2221101229. The reversal of 2221101220 is 221011222.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 2221101220.

It is not an unprimeable number, because it can be changed into a prime (2221101229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225805 + ... + 235435.

It is an arithmetic number, because the mean of its divisors is an integer number (104776896).

Almost surely, 2^2221101220 is an apocalyptic number.

2221101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221101220 is an abundant number, since it is smaller than the sum of its proper divisors (2808189788).

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

2221101220 is a wasteful number, since it uses less digits than its factorization.

2221101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10540 (or 10538 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2221101220 is about 47128.5605551453. The cubic root of 2221101220 is about 1304.7364147160.

Adding to 2221101220 its reverse (221011222), we get a palindrome (2442112442).

The spelling of 2221101220 in words is "two billion, two hundred twenty-one million, one hundred one thousand, two hundred twenty".