2100111120221 has 2 divisors, whose sum is σ = 2100111120222. Its totient is φ = 2100111120220.

The previous prime is 2100111120203. The next prime is 2100111120227. The reversal of 2100111120221 is 1220211110012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1388593564996 + 711517555225 = 1178386^2 + 843515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100111120221 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2100111120196 and 2100111120205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100111120227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050055560110 + 1050055560111.

It is an arithmetic number, because the mean of its divisors is an integer number (1050055560111).

Almost surely, 2^{2100111120221} is an apocalyptic number.

It is an amenable number.

2100111120221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100111120221 is an equidigital number, since it uses as much as digits as its factorization.

2100111120221 is an evil number, because the sum of its binary digits is even.

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

Adding to 2100111120221 its reverse (1220211110012), we get a palindrome (3320322230233).

The spelling of 2100111120221 in words is "two trillion, one hundred billion, one hundred eleven million, one hundred twenty thousand, two hundred twenty-one".