221873843 has 2 divisors, whose sum is σ = 221873844. Its totient is φ = 221873842.

The previous prime is 221873833. The next prime is 221873879. The reversal of 221873843 is 348378122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221873843 - 2²⁶ = 154764979 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221873797 and 221873806.

It is not a weakly prime, because it can be changed into another prime (221873833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110936921 + 110936922.

It is an arithmetic number, because the mean of its divisors is an integer number (110936922).

Almost surely, 2^221873843 is an apocalyptic number.

221873843 is a deficient number, since it is larger than the sum of its proper divisors (1).

221873843 is an equidigital number, since it uses as much as digits as its factorization.

221873843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 38.

The square root of 221873843 is about 14895.4302724023. The cubic root of 221873843 is about 605.3901751984.

The spelling of 221873843 in words is "two hundred twenty-one million, eight hundred seventy-three thousand, eight hundred forty-three".