11005421 has 4 divisors (see below), whose sum is σ = 12577632. Its totient is φ = 9433212.

The previous prime is 11005399. The next prime is 11005433. The reversal of 11005421 is 12450011.

11005421 is digitally balanced in base 3, 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11005421 - 2¹⁰ = 11004397 is a prime.

It is a super-2 number, since 2×11005421² = 242238582774482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11005396 and 11005405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11005321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 786095 + ... + 786108.

It is an arithmetic number, because the mean of its divisors is an integer number (3144408).

Almost surely, 2^11005421 is an apocalyptic number.

It is an amenable number.

11005421 is a deficient number, since it is larger than the sum of its proper divisors (1572211).

11005421 is an equidigital number, since it uses as much as digits as its factorization.

11005421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572210.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 11005421 is about 3317.4419361912. The cubic root of 11005421 is about 222.4345369845.

Adding to 11005421 its reverse (12450011), we get a palindrome (23455432).

The spelling of 11005421 in words is "eleven million, five thousand, four hundred twenty-one".