111001220221 has 2 divisors, whose sum is σ = 111001220222. Its totient is φ = 111001220220.

The previous prime is 111001220219. The next prime is 111001220227. The reversal of 111001220221 is 122022100111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56532195225 + 54469024996 = 237765^2 + 233386^2 .

It is an emirp because it is prime and its reverse (122022100111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111001220221 - 2¹ = 111001220219 is a prime.

Together with 111001220219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111001220227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55500610110 + 55500610111.

It is an arithmetic number, because the mean of its divisors is an integer number (55500610111).

Almost surely, 2^111001220221 is an apocalyptic number.

It is an amenable number.

111001220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111001220221 is an equidigital number, since it uses as much as digits as its factorization.

111001220221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111001220221 its reverse (122022100111), we get a palindrome (233023320332).

It can be divided in two parts, 11100 and 1220221, that added together give a palindrome (1231321).

The spelling of 111001220221 in words is "one hundred eleven billion, one million, two hundred twenty thousand, two hundred twenty-one".