221220201197 has 2 divisors, whose sum is σ = 221220201198. Its totient is φ = 221220201196.

The previous prime is 221220201179. The next prime is 221220201203. The reversal of 221220201197 is 791102022122.

Together with previous prime (221220201179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165379675561 + 55840525636 = 406669^2 + 236306^2 .

It is a cyclic number.

It is not a de Polignac number, because 221220201197 - 2⁸ = 221220200941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221220201997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610100598 + 110610100599.

It is an arithmetic number, because the mean of its divisors is an integer number (110610100599).

Almost surely, 2^221220201197 is an apocalyptic number.

It is an amenable number.

221220201197 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220201197 is an equidigital number, since it uses as much as digits as its factorization.

221220201197 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 29.

The spelling of 221220201197 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred one thousand, one hundred ninety-seven".