11440021 has 4 divisors (see below), whose sum is σ = 11706112. Its totient is φ = 11173932.

The previous prime is 11440003. The next prime is 11440027. The reversal of 11440021 is 12004411.

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: 12004411 = 47 ⋅255413.

It is a cyclic number.

It is not a de Polignac number, because 11440021 - 2¹⁹ = 10915733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11439983 and 11440010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11440027) 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, 132981 + ... + 133066.

It is an arithmetic number, because the mean of its divisors is an integer number (2926528).

Almost surely, 2^11440021 is an apocalyptic number.

It is an amenable number.

11440021 is a deficient number, since it is larger than the sum of its proper divisors (266091).

11440021 is an equidigital number, since it uses as much as digits as its factorization.

11440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266090.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 11440021 is about 3382.3100094462. The cubic root of 11440021 is about 225.3247721403.

Adding to 11440021 its reverse (12004411), we get a palindrome (23444432).

The spelling of 11440021 in words is "eleven million, four hundred forty thousand, twenty-one".