11213123121 has 12 divisors (see below), whose sum is σ = 16357098420. Its totient is φ = 7401400800.

The previous prime is 11213123113. The next prime is 11213123167. The reversal of 11213123121 is 12132131211.

11213123121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 5331920400 + 5881202721 = 73020^2 + 76689^2 .

It is not a de Polignac number, because 11213123121 - 2³ = 11213123113 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11213123094 and 11213123103.

It is not an unprimeable number, because it can be changed into a prime (11213123191) 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 11 ways as a sum of consecutive naturals, for example, 6166926 + ... + 6168743.

It is an arithmetic number, because the mean of its divisors is an integer number (1363091535).

Almost surely, 2^11213123121 is an apocalyptic number.

It is an amenable number.

11213123121 is a deficient number, since it is larger than the sum of its proper divisors (5143975299).

11213123121 is a wasteful number, since it uses less digits than its factorization.

11213123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12335776 (or 12335773 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 11213123121 its reverse (12132131211), we get a palindrome (23345254332).

The spelling of 11213123121 in words is "eleven billion, two hundred thirteen million, one hundred twenty-three thousand, one hundred twenty-one".