1211200110221 has 2 divisors, whose sum is σ = 1211200110222. Its totient is φ = 1211200110220.

The previous prime is 1211200110209. The next prime is 1211200110227. The reversal of 1211200110221 is 1220110021121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1210902168100 + 297942121 = 1100410^2 + 17261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211200110221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211200110196 and 1211200110205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211200110227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605600055110 + 605600055111.

It is an arithmetic number, because the mean of its divisors is an integer number (605600055111).

Almost surely, 2^{1211200110221} is an apocalyptic number.

It is an amenable number.

1211200110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211200110221 is an equidigital number, since it uses as much as digits as its factorization.

1211200110221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211200110221 its reverse (1220110021121), we get a palindrome (2431310131342).

The spelling of 1211200110221 in words is "one trillion, two hundred eleven billion, two hundred million, one hundred ten thousand, two hundred twenty-one".