2122111022221 has 2 divisors, whose sum is σ = 2122111022222. Its totient is φ = 2122111022220.

The previous prime is 2122111022149. The next prime is 2122111022233. The reversal of 2122111022221 is 1222201112212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1221489144100 + 900621878121 = 1105210^2 + 949011^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122111022221 - 2¹³ = 2122111014029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2122111022621) 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, 1061055511110 + 1061055511111.

It is an arithmetic number, because the mean of its divisors is an integer number (1061055511111).

Almost surely, 2^{2122111022221} is an apocalyptic number.

It is an amenable number.

2122111022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122111022221 is an equidigital number, since it uses as much as digits as its factorization.

2122111022221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2122111022221 its reverse (1222201112212), we get a palindrome (3344312134433).

The spelling of 2122111022221 in words is "two trillion, one hundred twenty-two billion, one hundred eleven million, twenty-two thousand, two hundred twenty-one".