221020110221 has 2 divisors, whose sum is σ = 221020110222. Its totient is φ = 221020110220.

The previous prime is 221020110211. The next prime is 221020110257. The reversal of 221020110221 is 122011020122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168584148100 + 52435962121 = 410590^2 + 228989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221020110221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221020110196 and 221020110205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221020110211) 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, 110510055110 + 110510055111.

It is an arithmetic number, because the mean of its divisors is an integer number (110510055111).

Almost surely, 2^221020110221 is an apocalyptic number.

It is an amenable number.

221020110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020110221 is an equidigital number, since it uses as much as digits as its factorization.

221020110221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221020110221 its reverse (122011020122), we get a palindrome (343031130343).

Subtracting from 221020110221 its reverse (122011020122), we obtain a palindrome (99009090099).

The spelling of 221020110221 in words is "two hundred twenty-one billion, twenty million, one hundred ten thousand, two hundred twenty-one".