11212121000105 has 4 divisors (see below), whose sum is σ = 13454545200132. Its totient is φ = 8969696800080.

The previous prime is 11212121000071. The next prime is 11212121000107. The reversal of 11212121000105 is 50100012121211.

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 6704495204416 + 4507625795689 = 2589304^2 + 2123117^2 .

It is not a de Polignac number, because 11212121000105 - 2¹⁶ = 11212120934569 is a prime.

It is a super-2 number, since 2×11212121000105² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11212121000107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1121212100006 + ... + 1121212100015.

It is an arithmetic number, because the mean of its divisors is an integer number (3363636300033).

Almost surely, 2^{11212121000105} is an apocalyptic number.

It is an amenable number.

11212121000105 is a deficient number, since it is larger than the sum of its proper divisors (2242424200027).

11212121000105 is an equidigital number, since it uses as much as digits as its factorization.

11212121000105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242424200026.

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 11212121000105 its reverse (50100012121211), we get a palindrome (61312133121316).

The spelling of 11212121000105 in words is "eleven trillion, two hundred twelve billion, one hundred twenty-one million, one hundred five", and thus it is an aban number.