218021983 has 2 divisors, whose sum is σ = 218021984. Its totient is φ = 218021982.

The previous prime is 218021959. The next prime is 218022011. The reversal of 218021983 is 389120812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 218021983 - 2⁹ = 218021471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218021483) 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, 109010991 + 109010992.

It is an arithmetic number, because the mean of its divisors is an integer number (109010992).

Almost surely, 2^218021983 is an apocalyptic number.

218021983 is a deficient number, since it is larger than the sum of its proper divisors (1).

218021983 is an equidigital number, since it uses as much as digits as its factorization.

218021983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 218021983 is about 14765.5674797821. The cubic root of 218021983 is about 601.8663947460.

The spelling of 218021983 in words is "two hundred eighteen million, twenty-one thousand, nine hundred eighty-three".