110221220981 has 2 divisors, whose sum is σ = 110221220982. Its totient is φ = 110221220980.

The previous prime is 110221220951. The next prime is 110221220999. The reversal of 110221220981 is 189022122011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109461722500 + 759498481 = 330850^2 + 27559^2 .

It is an emirp because it is prime and its reverse (189022122011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 110221220981 - 2³⁴ = 93041351797 is a prime.

It is a super-2 number, since 2×110221220981² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (110221220951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55110610490 + 55110610491.

It is an arithmetic number, because the mean of its divisors is an integer number (55110610491).

Almost surely, 2^110221220981 is an apocalyptic number.

It is an amenable number.

110221220981 is a deficient number, since it is larger than the sum of its proper divisors (1).

110221220981 is an equidigital number, since it uses as much as digits as its factorization.

110221220981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

Adding to 110221220981 its reverse (189022122011), we get a palindrome (299243342992).

The spelling of 110221220981 in words is "one hundred ten billion, two hundred twenty-one million, two hundred twenty thousand, nine hundred eighty-one".