21002220122041 has 2 divisors, whose sum is σ = 21002220122042. Its totient is φ = 21002220122040.

The previous prime is 21002220121957. The next prime is 21002220122047. The reversal of 21002220122041 is 14022102220012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20255760409600 + 746459712441 = 4500640^2 + 863979^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002220122041 is a prime.

It is not a weakly prime, because it can be changed into another prime (21002220122047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501110061020 + 10501110061021.

It is an arithmetic number, because the mean of its divisors is an integer number (10501110061021).

Almost surely, 2^{21002220122041} is an apocalyptic number.

It is an amenable number.

21002220122041 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002220122041 is an equidigital number, since it uses as much as digits as its factorization.

21002220122041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21002220122041 its reverse (14022102220012), we get a palindrome (35024322342053).

The spelling of 21002220122041 in words is "twenty-one trillion, two billion, two hundred twenty million, one hundred twenty-two thousand, forty-one".