21113020220221 has 2 divisors, whose sum is σ = 21113020220222. Its totient is φ = 21113020220220.

The previous prime is 21113020220153. The next prime is 21113020220269. The reversal of 21113020220221 is 12202202031112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20152108592100 + 960911628121 = 4489110^2 + 980261^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113020220221 - 2¹⁷ = 21113020089149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113020220291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556510110110 + 10556510110111.

It is an arithmetic number, because the mean of its divisors is an integer number (10556510110111).

Almost surely, 2^{21113020220221} is an apocalyptic number.

It is an amenable number.

21113020220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113020220221 is an equidigital number, since it uses as much as digits as its factorization.

21113020220221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21113020220221 its reverse (12202202031112), we get a palindrome (33315222251333).

The spelling of 21113020220221 in words is "twenty-one trillion, one hundred thirteen billion, twenty million, two hundred twenty thousand, two hundred twenty-one".