11478821 has 4 divisors (see below), whose sum is σ = 11493132. Its totient is φ = 11464512.

The previous prime is 11478799. The next prime is 11478827. The reversal of 11478821 is 12887411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12887411 = 17 ⋅758083.

It can be written as a sum of positive squares in 2 ways, for example, as 7022500 + 4456321 = 2650^2 + 2111^2 .

It is a cyclic number.

It is not a de Polignac number, because 11478821 - 2¹⁰ = 11477797 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 (11478827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5876 + ... + 7581.

It is an arithmetic number, because the mean of its divisors is an integer number (2873283).

Almost surely, 2^11478821 is an apocalyptic number.

It is an amenable number.

11478821 is a deficient number, since it is larger than the sum of its proper divisors (14311).

11478821 is an equidigital number, since it uses as much as digits as its factorization.

11478821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14310.

The product of its digits is 3584, while the sum is 32.

The square root of 11478821 is about 3388.0408793283. The cubic root of 11478821 is about 225.5792220209.

The spelling of 11478821 in words is "eleven million, four hundred seventy-eight thousand, eight hundred twenty-one".