2111221220201 has 2 divisors, whose sum is σ = 2111221220202. Its totient is φ = 2111221220200.

The previous prime is 2111221220167. The next prime is 2111221220219. The reversal of 2111221220201 is 1020221221112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2009941340176 + 101279880025 = 1417724^2 + 318245^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111221220201 - 2³⁸ = 1836343313257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2111221220201.

It is not a weakly prime, because it can be changed into another prime (2111221228201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055610610100 + 1055610610101.

It is an arithmetic number, because the mean of its divisors is an integer number (1055610610101).

Almost surely, 2^{2111221220201} is an apocalyptic number.

It is an amenable number.

2111221220201 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111221220201 is an equidigital number, since it uses as much as digits as its factorization.

2111221220201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2111221220201 its reverse (1020221221112), we get a palindrome (3131442441313).

The spelling of 2111221220201 in words is "two trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, two hundred one".