11188421 has 4 divisors (see below), whose sum is σ = 11209644. Its totient is φ = 11167200.

The previous prime is 11188399. The next prime is 11188433. The reversal of 11188421 is 12488111.

11188421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12488111 = 19 ⋅657269.

It can be written as a sum of positive squares in 2 ways, for example, as 2515396 + 8673025 = 1586^2 + 2945^2 .

It is a cyclic number.

It is not a de Polignac number, because 11188421 - 2⁶ = 11188357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11188451) 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, 9800 + ... + 10881.

It is an arithmetic number, because the mean of its divisors is an integer number (2802411).

Almost surely, 2^11188421 is an apocalyptic number.

It is an amenable number.

11188421 is a deficient number, since it is larger than the sum of its proper divisors (21223).

11188421 is an equidigital number, since it uses as much as digits as its factorization.

11188421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21222.

The product of its digits is 512, while the sum is 26.

The square root of 11188421 is about 3344.9097147756. The cubic root of 11188421 is about 223.6606588585.

The spelling of 11188421 in words is "eleven million, one hundred eighty-eight thousand, four hundred twenty-one".