21058218113 has 2 divisors, whose sum is σ = 21058218114. Its totient is φ = 21058218112.

The previous prime is 21058218089. The next prime is 21058218131. The reversal of 21058218113 is 31181285012.

Together with next prime (21058218131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13028624449 + 8029593664 = 114143^2 + 89608^2 .

It is a cyclic number.

It is not a de Polignac number, because 21058218113 - 2⁸ = 21058217857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21058218113.

It is not a weakly prime, because it can be changed into another prime (21058218143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10529109056 + 10529109057.

It is an arithmetic number, because the mean of its divisors is an integer number (10529109057).

Almost surely, 2^21058218113 is an apocalyptic number.

It is an amenable number.

21058218113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21058218113 is an equidigital number, since it uses as much as digits as its factorization.

21058218113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 32.

The spelling of 21058218113 in words is "twenty-one billion, fifty-eight million, two hundred eighteen thousand, one hundred thirteen".