2221050905 has 4 divisors (see below), whose sum is σ = 2665261092. Its totient is φ = 1776840720.

The previous prime is 2221050899. The next prime is 2221050907. The reversal of 2221050905 is 5090501222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 674752576 + 1546298329 = 25976^2 + 39323^2 .

It is not a de Polignac number, because 2221050905 - 2⁶ = 2221050841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221050907) 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 3 ways as a sum of consecutive naturals, for example, 222105086 + ... + 222105095.

It is an arithmetic number, because the mean of its divisors is an integer number (666315273).

Almost surely, 2^2221050905 is an apocalyptic number.

It is an amenable number.

2221050905 is a deficient number, since it is larger than the sum of its proper divisors (444210187).

2221050905 is an equidigital number, since it uses as much as digits as its factorization.

2221050905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444210186.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 2221050905 is about 47128.0267463003. The cubic root of 2221050905 is about 1304.7265624998.

The spelling of 2221050905 in words is "two billion, two hundred twenty-one million, fifty thousand, nine hundred five".