21112001109197 has 2 divisors, whose sum is σ = 21112001109198. Its totient is φ = 21112001109196.

The previous prime is 21112001109191. The next prime is 21112001109233. The reversal of 21112001109197 is 79190110021112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20589986189161 + 522014920036 = 4537619^2 + 722506^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112001109197 - 2⁴ = 21112001109181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112001109191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556000554598 + 10556000554599.

It is an arithmetic number, because the mean of its divisors is an integer number (10556000554599).

Almost surely, 2^{21112001109197} is an apocalyptic number.

It is an amenable number.

21112001109197 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112001109197 is an equidigital number, since it uses as much as digits as its factorization.

21112001109197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 35.

The spelling of 21112001109197 in words is "twenty-one trillion, one hundred twelve billion, one million, one hundred nine thousand, one hundred ninety-seven".