2100022221221 has 2 divisors, whose sum is σ = 2100022221222. Its totient is φ = 2100022221220.

The previous prime is 2100022221203. The next prime is 2100022221229. The reversal of 2100022221221 is 1221222200012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1171957804900 + 928064416321 = 1082570^2 + 963361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100022221221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2100022221221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100022221229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050011110610 + 1050011110611.

It is an arithmetic number, because the mean of its divisors is an integer number (1050011110611).

Almost surely, 2^{2100022221221} is an apocalyptic number.

It is an amenable number.

2100022221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100022221221 is an equidigital number, since it uses as much as digits as its factorization.

2100022221221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2100022221221 its reverse (1221222200012), we get a palindrome (3321244421233).

The spelling of 2100022221221 in words is "two trillion, one hundred billion, twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".