2018671821 has 16 divisors (see below), whose sum is σ = 2992680000. Its totient is φ = 1344856464.

The previous prime is 2018671799. The next prime is 2018671829. The reversal of 2018671821 is 1281768102.

It is not a de Polignac number, because 2018671821 - 2²¹ = 2016574669 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2018671829) 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 15 ways as a sum of consecutive naturals, for example, 15535 + ... + 65411.

It is an arithmetic number, because the mean of its divisors is an integer number (187042500).

Almost surely, 2^2018671821 is an apocalyptic number.

It is an amenable number.

2018671821 is a deficient number, since it is larger than the sum of its proper divisors (974008179).

2018671821 is a wasteful number, since it uses less digits than its factorization.

2018671821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51385 (or 51379 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 2018671821 is about 44929.6318814210. The cubic root of 2018671821 is about 1263.8297479810.

The spelling of 2018671821 in words is "two billion, eighteen million, six hundred seventy-one thousand, eight hundred twenty-one".