212216612197 has 2 divisors, whose sum is σ = 212216612198. Its totient is φ = 212216612196.

The previous prime is 212216612173. The next prime is 212216612233. The reversal of 212216612197 is 791216612212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212190130881 + 26481316 = 460641^2 + 5146^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212216612197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212216612297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106108306098 + 106108306099.

It is an arithmetic number, because the mean of its divisors is an integer number (106108306099).

Almost surely, 2^212216612197 is an apocalyptic number.

It is an amenable number.

212216612197 is a deficient number, since it is larger than the sum of its proper divisors (1).

212216612197 is an equidigital number, since it uses as much as digits as its factorization.

212216612197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The spelling of 212216612197 in words is "two hundred twelve billion, two hundred sixteen million, six hundred twelve thousand, one hundred ninety-seven".