221090843 has 2 divisors, whose sum is σ = 221090844. Its totient is φ = 221090842.

The previous prime is 221090827. The next prime is 221090869. The reversal of 221090843 is 348090122.

221090843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221090843 - 2⁴ = 221090827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221090803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110545421 + 110545422.

It is an arithmetic number, because the mean of its divisors is an integer number (110545422).

Almost surely, 2^221090843 is an apocalyptic number.

221090843 is a deficient number, since it is larger than the sum of its proper divisors (1).

221090843 is an equidigital number, since it uses as much as digits as its factorization.

221090843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 221090843 is about 14869.1238141324. The cubic root of 221090843 is about 604.6771886234.

The spelling of 221090843 in words is "two hundred twenty-one million, ninety thousand, eight hundred forty-three".