11242121 has 4 divisors (see below), whose sum is σ = 12264144. Its totient is φ = 10220100.

The previous prime is 11242109. The next prime is 11242123. The reversal of 11242121 is 12124211.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12124211 = 11 ⋅1102201.

It is a de Polignac number, because none of the positive numbers 2^k-11242121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11242096 and 11242105.

It is not an unprimeable number, because it can be changed into a prime (11242123) 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, 510995 + ... + 511016.

It is an arithmetic number, because the mean of its divisors is an integer number (3066036).

Almost surely, 2^11242121 is an apocalyptic number.

11242121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11242121 is a deficient number, since it is larger than the sum of its proper divisors (1022023).

11242121 is a wasteful number, since it uses less digits than its factorization.

11242121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022022.

The product of its digits is 32, while the sum is 14.

The square root of 11242121 is about 3352.9272285572. The cubic root of 11242121 is about 224.0179154995.

Adding to 11242121 its reverse (12124211), we get a palindrome (23366332).

The spelling of 11242121 in words is "eleven million, two hundred forty-two thousand, one hundred twenty-one".