2221091723 has 4 divisors (see below), whose sum is σ = 2262999168. Its totient is φ = 2179184280.

The previous prime is 2221091699. The next prime is 2221091731. The reversal of 2221091723 is 3271901222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3271901222 = 2 ⋅1635950611.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221091723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221091753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20953643 + ... + 20953748.

It is an arithmetic number, because the mean of its divisors is an integer number (565749792).

Almost surely, 2^2221091723 is an apocalyptic number.

2221091723 is a deficient number, since it is larger than the sum of its proper divisors (41907445).

2221091723 is an equidigital number, since it uses as much as digits as its factorization.

2221091723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41907444.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 2221091723 is about 47128.4597987246. The cubic root of 2221091723 is about 1304.7345551130.

Adding to 2221091723 its reverse (3271901222), we get a palindrome (5492992945).

The spelling of 2221091723 in words is "two billion, two hundred twenty-one million, ninety-one thousand, seven hundred twenty-three".