219868021 has 12 divisors (see below), whose sum is σ = 238546368. Its totient is φ = 202519232.

The previous prime is 219868013. The next prime is 219868039. The reversal of 219868021 is 120868912.

It is not a de Polignac number, because 219868021 - 2³ = 219868013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219868001) 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 in 11 ways as a sum of consecutive naturals, for example, 5490 + ... + 21676.

It is an arithmetic number, because the mean of its divisors is an integer number (19878864).

Almost surely, 2^219868021 is an apocalyptic number.

It is an amenable number.

219868021 is a deficient number, since it is larger than the sum of its proper divisors (18678347).

219868021 is a wasteful number, since it uses less digits than its factorization.

219868021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16268 (or 16251 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 219868021 is about 14827.9472955632. The cubic root of 219868021 is about 603.5603325255.

The spelling of 219868021 in words is "two hundred nineteen million, eight hundred sixty-eight thousand, twenty-one".