11440421 has 4 divisors (see below), whose sum is σ = 11656332. Its totient is φ = 11224512.

The previous prime is 11440417. The next prime is 11440441. The reversal of 11440421 is 12404411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12404411 = 61 ⋅203351.

It can be written as a sum of positive squares in 2 ways, for example, as 9084196 + 2356225 = 3014^2 + 1535^2 .

It is a cyclic number.

It is not a de Polignac number, because 11440421 - 2² = 11440417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11440421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11440441) 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, 107876 + ... + 107981.

It is an arithmetic number, because the mean of its divisors is an integer number (2914083).

Almost surely, 2^11440421 is an apocalyptic number.

It is an amenable number.

11440421 is a deficient number, since it is larger than the sum of its proper divisors (215911).

11440421 is an equidigital number, since it uses as much as digits as its factorization.

11440421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215910.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 11440421 is about 3382.3691401147. The cubic root of 11440421 is about 225.3273982677.

Adding to 11440421 its reverse (12404411), we get a palindrome (23844832).

The spelling of 11440421 in words is "eleven million, four hundred forty thousand, four hundred twenty-one".