11182421 has 4 divisors (see below), whose sum is σ = 11190144. Its totient is φ = 11174700.

The previous prime is 11182397. The next prime is 11182427. The reversal of 11182421 is 12428111.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12428111 = 211 ⋅58901.

It is a cyclic number.

It is not a de Polignac number, because 11182421 - 2⁶ = 11182357 is a prime.

It is a deceptive number, since it divides R_11182420.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11182393 and 11182402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11182427) 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, 965 + ... + 4826.

It is an arithmetic number, because the mean of its divisors is an integer number (2797536).

Almost surely, 2^11182421 is an apocalyptic number.

11182421 is the 1931-st octagonal number.

It is an amenable number.

11182421 is a deficient number, since it is larger than the sum of its proper divisors (7723).

11182421 is an equidigital number, since it uses as much as digits as its factorization.

11182421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7722.

The product of its digits is 128, while the sum is 20.

The square root of 11182421 is about 3344.0127093060. The cubic root of 11182421 is about 223.6206709726.

The spelling of 11182421 in words is "eleven million, one hundred eighty-two thousand, four hundred twenty-one".