11489821 has 4 divisors (see below), whose sum is σ = 13131232. Its totient is φ = 9848412.

The previous prime is 11489789. The next prime is 11489827. The reversal of 11489821 is 12898411.

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: 12898411 = 829 ⋅15559.

It is not a de Polignac number, because 11489821 - 2⁵ = 11489789 is a prime.

It is a super-2 number, since 2×11489821² = 264031973224082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11489827) 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, 820695 + ... + 820708.

It is an arithmetic number, because the mean of its divisors is an integer number (3282808).

Almost surely, 2^11489821 is an apocalyptic number.

It is an amenable number.

11489821 is a deficient number, since it is larger than the sum of its proper divisors (1641411).

11489821 is an equidigital number, since it uses as much as digits as its factorization.

11489821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641410.

The product of its digits is 4608, while the sum is 34.

The square root of 11489821 is about 3389.6638476404. The cubic root of 11489821 is about 225.6512555292.

The spelling of 11489821 in words is "eleven million, four hundred eighty-nine thousand, eight hundred twenty-one".