221236809145843 has 2 divisors, whose sum is σ = 221236809145844. Its totient is φ = 221236809145842.

The previous prime is 221236809145841. The next prime is 221236809145907. The reversal of 221236809145843 is 348541908632122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221236809145843 - 2¹ = 221236809145841 is a prime.

Together with 221236809145841, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221236809145841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110618404572921 + 110618404572922.

It is an arithmetic number, because the mean of its divisors is an integer number (110618404572922).

Almost surely, 2^{221236809145843} is an apocalyptic number.

221236809145843 is a deficient number, since it is larger than the sum of its proper divisors (1).

221236809145843 is an equidigital number, since it uses as much as digits as its factorization.

221236809145843 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19906560, while the sum is 58.

The spelling of 221236809145843 in words is "two hundred twenty-one trillion, two hundred thirty-six billion, eight hundred nine million, one hundred forty-five thousand, eight hundred forty-three".