11821147 has 4 divisors (see below), whose sum is σ = 12730480. Its totient is φ = 10911816.

The previous prime is 11821127. The next prime is 11821151. The reversal of 11821147 is 74112811.

11821147 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74112811 = 3593 ⋅20627.

It is a cyclic number.

It is not a de Polignac number, because 11821147 - 2¹¹ = 11819099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11821127) 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, 454647 + ... + 454672.

It is an arithmetic number, because the mean of its divisors is an integer number (3182620).

Almost surely, 2^11821147 is an apocalyptic number.

11821147 is a deficient number, since it is larger than the sum of its proper divisors (909333).

11821147 is an equidigital number, since it uses as much as digits as its factorization.

11821147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909332.

The product of its digits is 448, while the sum is 25.

The square root of 11821147 is about 3438.1894944869. The cubic root of 11821147 is about 227.7997305213.

Adding to 11821147 its reverse (74112811), we get a palindrome (85933958).

The spelling of 11821147 in words is "eleven million, eight hundred twenty-one thousand, one hundred forty-seven".