110002121921 has 2 divisors, whose sum is σ = 110002121922. Its totient is φ = 110002121920.

The previous prime is 110002121909. The next prime is 110002122023. The reversal of 110002121921 is 129121200011.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110001008896 + 1113025 = 331664^2 + 1055^2 .

It is an emirp because it is prime and its reverse (129121200011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 110002121921 - 2¹⁰ = 110002120897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 110002121893 and 110002121902.

It is not a weakly prime, because it can be changed into another prime (110002721921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55001060960 + 55001060961.

It is an arithmetic number, because the mean of its divisors is an integer number (55001060961).

Almost surely, 2^110002121921 is an apocalyptic number.

It is an amenable number.

110002121921 is a deficient number, since it is larger than the sum of its proper divisors (1).

110002121921 is an equidigital number, since it uses as much as digits as its factorization.

110002121921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 110002121921 its reverse (129121200011), we get a palindrome (239123321932).

The spelling of 110002121921 in words is "one hundred ten billion, two million, one hundred twenty-one thousand, nine hundred twenty-one".