110220121981 has 2 divisors, whose sum is σ = 110220121982. Its totient is φ = 110220121980.

The previous prime is 110220121967. The next prime is 110220122009. The reversal of 110220121981 is 189121022011.

It is an a-pointer prime, because the next prime (110220122009) can be obtained adding 110220121981 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84544866756 + 25675255225 = 290766^2 + 160235^2 .

It is an emirp because it is prime and its reverse (189121022011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 110220121981 - 2¹⁹ = 110219597693 is a prime.

It is a super-2 number, since 2×110220121981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (110220121481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55110060990 + 55110060991.

It is an arithmetic number, because the mean of its divisors is an integer number (55110060991).

Almost surely, 2^110220121981 is an apocalyptic number.

It is an amenable number.

110220121981 is a deficient number, since it is larger than the sum of its proper divisors (1).

110220121981 is an equidigital number, since it uses as much as digits as its factorization.

110220121981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 28.

Adding to 110220121981 its reverse (189121022011), we get a palindrome (299341143992).

The spelling of 110220121981 in words is "one hundred ten billion, two hundred twenty million, one hundred twenty-one thousand, nine hundred eighty-one".