11821145 has 24 divisors (see below), whose sum is σ = 16688832. Its totient is φ = 7872480.

The previous prime is 11821127. The next prime is 11821151. The reversal of 11821145 is 54112811.

11821145 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11821145 - 2⁶ = 11821081 is a prime.

It is a super-2 number, since 2×11821145² = 279478938222050, which contains 22 as substring.

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 11821145.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 166460 + ... + 166530.

It is an arithmetic number, because the mean of its divisors is an integer number (695368).

Almost surely, 2^11821145 is an apocalyptic number.

It is an amenable number.

11821145 is a deficient number, since it is larger than the sum of its proper divisors (4867687).

11821145 is an frugal number, since it uses more digits than its factorization.

11821145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 150 counting only the distinct ones).

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

The square root of 11821145 is about 3438.1892036361. The cubic root of 11821145 is about 227.7997176743.

Adding to 11821145 its reverse (54112811), we get a palindrome (65933956).

The spelling of 11821145 in words is "eleven million, eight hundred twenty-one thousand, one hundred forty-five".