11821671 has 12 divisors (see below), whose sum is σ = 17137848. Its totient is φ = 7852464.

The previous prime is 11821661. The next prime is 11821673. The reversal of 11821671 is 17612811.

11821671 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11821671 - 2⁷ = 11821543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11821673) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 396 + ... + 4878.

It is an arithmetic number, because the mean of its divisors is an integer number (1428154).

Almost surely, 2^11821671 is an apocalyptic number.

11821671 is a deficient number, since it is larger than the sum of its proper divisors (5316177).

11821671 is a wasteful number, since it uses less digits than its factorization.

11821671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4782 (or 4779 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The square root of 11821671 is about 3438.2656965395. The cubic root of 11821671 is about 227.8030963902.

The spelling of 11821671 in words is "eleven million, eight hundred twenty-one thousand, six hundred seventy-one".