21058218111 has 32 divisors (see below), whose sum is σ = 33794767360. Its totient is φ = 11394141696.

The previous prime is 21058218089. The next prime is 21058218113. The reversal of 21058218111 is 11181285012.

It is not a de Polignac number, because 21058218111 - 2¹³ = 21058209919 is a prime.

It is the 145115-th Hogben number.

It is a Duffinian number.

It is a congruent number.

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

It is a nontrivial repunit in base 145114.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 840315 + ... + 865011.

It is an arithmetic number, because the mean of its divisors is an integer number (1056086480).

Almost surely, 2^21058218111 is an apocalyptic number.

21058218111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21058218111 is a deficient number, since it is larger than the sum of its proper divisors (12736549249).

21058218111 is a wasteful number, since it uses less digits than its factorization.

With its successor (21058218112) it forms an eRAP, since the sums of their prime factors are consecutive (26863 and 26864).

21058218111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26863.

The product of its (nonzero) digits is 1280, while the sum is 30.

The spelling of 21058218111 in words is "twenty-one billion, fifty-eight million, two hundred eighteen thousand, one hundred eleven".