21233213123197 has 2 divisors, whose sum is σ = 21233213123198. Its totient is φ = 21233213123196.

The previous prime is 21233213123191. The next prime is 21233213123263. The reversal of 21233213123197 is 79132131233212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20507230737081 + 725982386116 = 4528491^2 + 852046^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233213123197 - 2⁷ = 21233213123069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233213123191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616606561598 + 10616606561599.

It is an arithmetic number, because the mean of its divisors is an integer number (10616606561599).

Almost surely, 2^{21233213123197} is an apocalyptic number.

It is an amenable number.

21233213123197 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233213123197 is an equidigital number, since it uses as much as digits as its factorization.

21233213123197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 40.

The spelling of 21233213123197 in words is "twenty-one trillion, two hundred thirty-three billion, two hundred thirteen million, one hundred twenty-three thousand, one hundred ninety-seven".