2221722185 has 4 divisors (see below), whose sum is σ = 2666066628. Its totient is φ = 1777377744.

The previous prime is 2221722169. The next prime is 2221722187. The reversal of 2221722185 is 5812271222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5812271222 = 2 ⋅2906135611.

It can be written as a sum of positive squares in 2 ways, for example, as 1463215504 + 758506681 = 38252^2 + 27541^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221722185 - 2⁴ = 2221722169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221722187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222172214 + ... + 222172223.

It is an arithmetic number, because the mean of its divisors is an integer number (666516657).

Almost surely, 2^2221722185 is an apocalyptic number.

It is an amenable number.

2221722185 is a deficient number, since it is larger than the sum of its proper divisors (444344443).

2221722185 is an equidigital number, since it uses as much as digits as its factorization.

2221722185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444344442.

The product of its digits is 8960, while the sum is 32.

The square root of 2221722185 is about 47135.1480850543. The cubic root of 2221722185 is about 1304.8579940702.

The spelling of 2221722185 in words is "two billion, two hundred twenty-one million, seven hundred twenty-two thousand, one hundred eighty-five".