2211121002221 has 2 divisors, whose sum is σ = 2211121002222. Its totient is φ = 2211121002220.

The previous prime is 2211121002199. The next prime is 2211121002241. The reversal of 2211121002221 is 1222001211122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1210250812996 + 1000870189225 = 1100114^2 + 1000435^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211121002221 - 2⁶ = 2211121002157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2211121002221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2211121002241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1105560501110 + 1105560501111.

It is an arithmetic number, because the mean of its divisors is an integer number (1105560501111).

Almost surely, 2^{2211121002221} is an apocalyptic number.

It is an amenable number.

2211121002221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2211121002221 is an equidigital number, since it uses as much as digits as its factorization.

2211121002221 is an evil number, because the sum of its binary digits is even.

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

Adding to 2211121002221 its reverse (1222001211122), we get a palindrome (3433122213343).

The spelling of 2211121002221 in words is "two trillion, two hundred eleven billion, one hundred twenty-one million, two thousand, two hundred twenty-one".