11986821 has 48 divisors (see below), whose sum is σ = 22089600. Its totient is φ = 6209280.

The previous prime is 11986811. The next prime is 11986823. The reversal of 11986821 is 12868911.

It is not a de Polignac number, because 11986821 - 2⁵ = 11986789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11986823) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33781 + ... + 34133.

It is an arithmetic number, because the mean of its divisors is an integer number (460200).

Almost surely, 2^11986821 is an apocalyptic number.

11986821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11986821 is a deficient number, since it is larger than the sum of its proper divisors (10102779).

11986821 is a wasteful number, since it uses less digits than its factorization.

11986821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 374 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 11986821 is about 3462.1988677718. The cubic root of 11986821 is about 228.8590056486.

The spelling of 11986821 in words is "eleven million, nine hundred eighty-six thousand, eight hundred twenty-one".