1211211021197 has 2 divisors, whose sum is σ = 1211211021198. Its totient is φ = 1211211021196.

The previous prime is 1211211021161. The next prime is 1211211021287. The reversal of 1211211021197 is 7911201121121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 732417602596 + 478793418601 = 855814^2 + 691949^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211211021197 - 2¹² = 1211211017101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211211021107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605605510598 + 605605510599.

It is an arithmetic number, because the mean of its divisors is an integer number (605605510599).

Almost surely, 2^{1211211021197} is an apocalyptic number.

It is an amenable number.

1211211021197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211211021197 is an equidigital number, since it uses as much as digits as its factorization.

1211211021197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 29.

The spelling of 1211211021197 in words is "one trillion, two hundred eleven billion, two hundred eleven million, twenty-one thousand, one hundred ninety-seven".