21113011133209 has 2 divisors, whose sum is σ = 21113011133210. Its totient is φ = 21113011133208.

The previous prime is 21113011133197. The next prime is 21113011133299. The reversal of 21113011133209 is 90233111031112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17321411610000 + 3791599523209 = 4161900^2 + 1947203^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113011133209 - 2³⁵ = 21078651394841 is a prime.

It is a super-2 number, since 2×21113011133209² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21113011133299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556505566604 + 10556505566605.

It is an arithmetic number, because the mean of its divisors is an integer number (10556505566605).

Almost surely, 2^{21113011133209} is an apocalyptic number.

It is an amenable number.

21113011133209 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113011133209 is an equidigital number, since it uses as much as digits as its factorization.

21113011133209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 28.

The spelling of 21113011133209 in words is "twenty-one trillion, one hundred thirteen billion, eleven million, one hundred thirty-three thousand, two hundred nine".