11142121 has 4 divisors (see below), whose sum is σ = 11149012. Its totient is φ = 11135232.

The previous prime is 11142107. The next prime is 11142181. The reversal of 11142121 is 12124111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12124111 = 17 ⋅713183.

It can be written as a sum of positive squares in 2 ways, for example, as 6350400 + 4791721 = 2520^2 + 2189^2 .

It is a cyclic number.

It is not a de Polignac number, because 11142121 - 2⁹ = 11141609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11142181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445 + ... + 4741.

It is an arithmetic number, because the mean of its divisors is an integer number (2787253).

Almost surely, 2^11142121 is an apocalyptic number.

It is an amenable number.

11142121 is a deficient number, since it is larger than the sum of its proper divisors (6891).

11142121 is an equidigital number, since it uses as much as digits as its factorization.

11142121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6890.

The product of its digits is 16, while the sum is 13.

The square root of 11142121 is about 3337.9815757430. The cubic root of 11142121 is about 223.3517142863.

Adding to 11142121 its reverse (12124111), we get a palindrome (23266232).

The spelling of 11142121 in words is "eleven million, one hundred forty-two thousand, one hundred twenty-one".