105110000021 has 4 divisors (see below), whose sum is σ = 113195384652. Its totient is φ = 97024615392.

The previous prime is 105109999999. The next prime is 105110000029. The reversal of 105110000021 is 120000011501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49990699396 + 55119300625 = 223586^2 + 234775^2 .

It is a cyclic number.

It is not a de Polignac number, because 105110000021 - 2¹⁴ = 105109983637 is a prime.

It is a super-2 number, since 2×105110000021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 105109999957 and 105110000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105110000029) 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 in 3 ways as a sum of consecutive naturals, for example, 4042692296 + ... + 4042692321.

It is an arithmetic number, because the mean of its divisors is an integer number (28298846163).

Almost surely, 2^105110000021 is an apocalyptic number.

It is an amenable number.

105110000021 is a deficient number, since it is larger than the sum of its proper divisors (8085384631).

105110000021 is an equidigital number, since it uses as much as digits as its factorization.

105110000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8085384630.

The product of its (nonzero) digits is 10, while the sum is 11.

Adding to 105110000021 its reverse (120000011501), we get a palindrome (225110011522).

The spelling of 105110000021 in words is "one hundred five billion, one hundred ten million, twenty-one", and thus it is an aban number.