21058218112 has 32 divisors (see below), whose sum is σ = 41958765900. Its totient is φ = 10527390720.

The previous prime is 21058218089. The next prime is 21058218113. The reversal of 21058218112 is 21181285012.

It can be written as a sum of positive squares in 2 ways, for example, as 20216289856 + 841928256 = 142184^2 + 29016^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (21058218113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1202314 + ... + 1219702.

Almost surely, 2^21058218112 is an apocalyptic number.

It is an amenable number.

21058218112 is a deficient number, since it is larger than the sum of its proper divisors (20900547788).

21058218112 is an equidigital number, since it uses as much as digits as its factorization.

With its predecessor (21058218111) it forms an eRAP, since the sums of their prime factors are consecutive (26863 and 26864).

21058218112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26864 (or 26852 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 31.

The spelling of 21058218112 in words is "twenty-one billion, fifty-eight million, two hundred eighteen thousand, one hundred twelve".