211221221201197 has 2 divisors, whose sum is σ = 211221221201198. Its totient is φ = 211221221201196.

The previous prime is 211221221201191. The next prime is 211221221201227. The reversal of 211221221201197 is 791102122122112.

211221221201197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211049389396521 + 171831804676 = 14527539^2 + 414526^2 .

It is a cyclic number.

It is not a de Polignac number, because 211221221201197 - 2⁷ = 211221221201069 is a prime.

It is a super-2 number, since 2×211221221201197² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211221221201191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610610600598 + 105610610600599.

It is an arithmetic number, because the mean of its divisors is an integer number (105610610600599).

Almost surely, 2^{211221221201197} is an apocalyptic number.

It is an amenable number.

211221221201197 is a deficient number, since it is larger than the sum of its proper divisors (1).

211221221201197 is an equidigital number, since it uses as much as digits as its factorization.

211221221201197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 211221221201197 in words is "two hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, one hundred ninety-seven".