11145821 has 4 divisors (see below), whose sum is σ = 11280192. Its totient is φ = 11011452.

The previous prime is 11145817. The next prime is 11145839. The reversal of 11145821 is 12854111.

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: 12854111 = 1229 ⋅10459.

It is a cyclic number.

It is not a de Polignac number, because 11145821 - 2² = 11145817 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 (11145221) 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, 67061 + ... + 67226.

It is an arithmetic number, because the mean of its divisors is an integer number (2820048).

Almost surely, 2^11145821 is an apocalyptic number.

It is an amenable number.

11145821 is a deficient number, since it is larger than the sum of its proper divisors (134371).

11145821 is an equidigital number, since it uses as much as digits as its factorization.

11145821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134370.

The product of its digits is 320, while the sum is 23.

The square root of 11145821 is about 3338.5357568850. The cubic root of 11145821 is about 223.3764345912.

Adding to 11145821 its reverse (12854111), we get a palindrome (23999932).

The spelling of 11145821 in words is "eleven million, one hundred forty-five thousand, eight hundred twenty-one".