221020112220221 has 2 divisors, whose sum is σ = 221020112220222. Its totient is φ = 221020112220220.

The previous prime is 221020112220181. The next prime is 221020112220287. The reversal of 221020112220221 is 122022211020122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201721970728996 + 19298141491225 = 14202886^2 + 4392965^2 .

It is a cyclic number.

It is not a de Polignac number, because 221020112220221 - 2¹⁰ = 221020112219197 is a prime.

It is a super-4 number, since 4×221020112220221⁴ (a number of 58 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221020112220193 and 221020112220202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221020112228221) 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, 110510056110110 + 110510056110111.

It is an arithmetic number, because the mean of its divisors is an integer number (110510056110111).

Almost surely, 2^{221020112220221} is an apocalyptic number.

It is an amenable number.

221020112220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020112220221 is an equidigital number, since it uses as much as digits as its factorization.

221020112220221 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 20.

Adding to 221020112220221 its reverse (122022211020122), we get a palindrome (343042323240343).

The spelling of 221020112220221 in words is "two hundred twenty-one trillion, twenty billion, one hundred twelve million, two hundred twenty thousand, two hundred twenty-one".