11142221 has 4 divisors (see below), whose sum is σ = 11172000. Its totient is φ = 11112444.

The previous prime is 11142211. The next prime is 11142223. The reversal of 11142221 is 12224111.

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: 12224111 = 1667 ⋅7333.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11142221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11142196 and 11142205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11142223) 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, 14321 + ... + 15078.

It is an arithmetic number, because the mean of its divisors is an integer number (2793000).

Almost surely, 2^11142221 is an apocalyptic number.

It is an amenable number.

11142221 is a deficient number, since it is larger than the sum of its proper divisors (29779).

11142221 is an equidigital number, since it uses as much as digits as its factorization.

11142221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29778.

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

The square root of 11142221 is about 3337.9965548215. The cubic root of 11142221 is about 223.3523824746.

Adding to 11142221 its reverse (12224111), we get a palindrome (23366332).

The spelling of 11142221 in words is "eleven million, one hundred forty-two thousand, two hundred twenty-one".