2221855884 has 72 divisors (see below), whose sum is σ = 5699886192. Its totient is φ = 729655680.

The previous prime is 2221855861. The next prime is 2221855939. The reversal of 2221855884 is 4885581222.

2221855884 is a `hidden beast` number, since 2 + 2 + 2 + 18 + 558 + 84 = 666.

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, 1376662 + ... + 1378274.

It is an arithmetic number, because the mean of its divisors is an integer number (79165086).

Almost surely, 2^2221855884 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2221855884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2849943096).

2221855884 is an abundant number, since it is smaller than the sum of its proper divisors (3478030308).

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

2221855884 is a wasteful number, since it uses less digits than its factorization.

2221855884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2167 (or 2162 counting only the distinct ones).

The product of its digits is 409600, while the sum is 45.

The square root of 2221855884 is about 47136.5663153353. The cubic root of 2221855884 is about 1304.8841681662.

The spelling of 2221855884 in words is "two billion, two hundred twenty-one million, eight hundred fifty-five thousand, eight hundred eighty-four".