221110110121 has 2 divisors, whose sum is σ = 221110110122. Its totient is φ = 221110110120.

The previous prime is 221110110097. The next prime is 221110110131. The reversal of 221110110121 is 121011011122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199062314896 + 22047795225 = 446164^2 + 148485^2 .

It is a cyclic number.

It is not a de Polignac number, because 221110110121 - 2⁷ = 221110109993 is a prime.

It is not a weakly prime, because it can be changed into another prime (221110110131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555055060 + 110555055061.

It is an arithmetic number, because the mean of its divisors is an integer number (110555055061).

Almost surely, 2^221110110121 is an apocalyptic number.

It is an amenable number.

221110110121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221110110121 is an equidigital number, since it uses as much as digits as its factorization.

221110110121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 221110110121 its reverse (121011011122), we get a palindrome (342121121243).

It can be divided in two parts, 2211101 and 10121, that added together give a palindrome (2221222).

The spelling of 221110110121 in words is "two hundred twenty-one billion, one hundred ten million, one hundred ten thousand, one hundred twenty-one".