221985383 has 2 divisors, whose sum is σ = 221985384. Its totient is φ = 221985382.

The previous prime is 221985377. The next prime is 221985403. The reversal of 221985383 is 383589122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221985383 - 2¹⁰ = 221984359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221985383.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221985353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110992691 + 110992692.

It is an arithmetic number, because the mean of its divisors is an integer number (110992692).

Almost surely, 2^221985383 is an apocalyptic number.

221985383 is a deficient number, since it is larger than the sum of its proper divisors (1).

221985383 is an equidigital number, since it uses as much as digits as its factorization.

221985383 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 221985383 is about 14899.1739032740. The cubic root of 221985383 is about 605.4916050726.

The spelling of 221985383 in words is "two hundred twenty-one million, nine hundred eighty-five thousand, three hundred eighty-three".