221211140197 has 2 divisors, whose sum is σ = 221211140198. Its totient is φ = 221211140196.

The previous prime is 221211140159. The next prime is 221211140231. The reversal of 221211140197 is 791041112122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200304582916 + 20906557281 = 447554^2 + 144591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221211140197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221211140597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605570098 + 110605570099.

It is an arithmetic number, because the mean of its divisors is an integer number (110605570099).

Almost surely, 2^221211140197 is an apocalyptic number.

It is an amenable number.

221211140197 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211140197 is an equidigital number, since it uses as much as digits as its factorization.

221211140197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 31.

The spelling of 221211140197 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred forty thousand, one hundred ninety-seven".