1211012221201 has 2 divisors, whose sum is σ = 1211012221202. Its totient is φ = 1211012221200.

The previous prime is 1211012221183. The next prime is 1211012221207. The reversal of 1211012221201 is 1021222101121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1197153281025 + 13858940176 = 1094145^2 + 117724^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211012221201 - 2⁵ = 1211012221169 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211012221207) 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, 605506110600 + 605506110601.

It is an arithmetic number, because the mean of its divisors is an integer number (605506110601).

Almost surely, 2^{1211012221201} is an apocalyptic number.

It is an amenable number.

1211012221201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211012221201 is an equidigital number, since it uses as much as digits as its factorization.

1211012221201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1211012221201 its reverse (1021222101121), we get a palindrome (2232234322322).

The spelling of 1211012221201 in words is "one trillion, two hundred eleven billion, twelve million, two hundred twenty-one thousand, two hundred one".