11641821 has 32 divisors (see below), whose sum is σ = 17262720. Its totient is φ = 6948864.

The previous prime is 11641811. The next prime is 11641837. The reversal of 11641821 is 12814611.

11641821 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 11641821 - 2⁶ = 11641757 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11641791 and 11641800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11641811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 159441 + ... + 159513.

It is an arithmetic number, because the mean of its divisors is an integer number (539460).

Almost surely, 2^11641821 is an apocalyptic number.

It is an amenable number.

11641821 is a deficient number, since it is larger than the sum of its proper divisors (5620899).

11641821 is a wasteful number, since it uses less digits than its factorization.

11641821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205.

The product of its digits is 384, while the sum is 24.

The square root of 11641821 is about 3412.0112836859. The cubic root of 11641821 is about 226.6419540051.

The spelling of 11641821 in words is "eleven million, six hundred forty-one thousand, eight hundred twenty-one".