2821222500 has 120 divisors (see below), whose sum is σ = 8255607360. Its totient is φ = 749616000.

The previous prime is 2821222493. The next prime is 2821222501. The reversal of 2821222500 is 52221282.

It is not an unprimeable number, because it can be changed into a prime (2821222501) 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 39 ways as a sum of consecutive naturals, for example, 2917017 + ... + 2917983.

It is an arithmetic number, because the mean of its divisors is an integer number (68796728).

Almost surely, 2^2821222500 is an apocalyptic number.

2821222500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2821222500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4127803680).

2821222500 is an abundant number, since it is smaller than the sum of its proper divisors (5434384860).

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

2821222500 is a wasteful number, since it uses less digits than its factorization.

2821222500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 2821222500 is about 53115.1814456093. The cubic root of 2821222500 is about 1413.0117705946.

Adding to 2821222500 its reverse (52221282), we get a palindrome (2873443782).

The spelling of 2821222500 in words is "two billion, eight hundred twenty-one million, two hundred twenty-two thousand, five hundred".