221110100221 has 2 divisors, whose sum is σ = 221110100222. Its totient is φ = 221110100220.

The previous prime is 221110100219. The next prime is 221110100231. The reversal of 221110100221 is 122001011122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209791480900 + 11318619321 = 458030^2 + 106389^2 .

It is a cyclic number.

It is not a de Polignac number, because 221110100221 - 2¹ = 221110100219 is a prime.

Together with 221110100219, 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 (221110100231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555050110 + 110555050111.

It is an arithmetic number, because the mean of its divisors is an integer number (110555050111).

Almost surely, 2^221110100221 is an apocalyptic number.

It is an amenable number.

221110100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221110100221 is an equidigital number, since it uses as much as digits as its factorization.

221110100221 is an odious number, because the sum of its binary digits is odd.

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

Adding to 221110100221 its reverse (122001011122), we get a palindrome (343111111343).

The spelling of 221110100221 in words is "two hundred twenty-one billion, one hundred ten million, one hundred thousand, two hundred twenty-one".