2221816823 has 2 divisors, whose sum is σ = 2221816824. Its totient is φ = 2221816822.

The previous prime is 2221816799. The next prime is 2221816871. The reversal of 2221816823 is 3286181222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2221816823 - 2²⁰ = 2220768247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221816873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110908411 + 1110908412.

It is an arithmetic number, because the mean of its divisors is an integer number (1110908412).

Almost surely, 2^2221816823 is an apocalyptic number.

2221816823 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221816823 is an equidigital number, since it uses as much as digits as its factorization.

2221816823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 35.

The square root of 2221816823 is about 47136.1519748908. The cubic root of 2221816823 is about 1304.8765213488.

The spelling of 2221816823 in words is "two billion, two hundred twenty-one million, eight hundred sixteen thousand, eight hundred twenty-three".