11933821 has 4 divisors (see below), whose sum is σ = 12097372. Its totient is φ = 11770272.

The previous prime is 11933807. The next prime is 11933837. The reversal of 11933821 is 12833911.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5354596 + 6579225 = 2314^2 + 2565^2 .

It is a cyclic number.

It is not a de Polignac number, because 11933821 - 2⁷ = 11933693 is a prime.

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 11933821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11933861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81666 + ... + 81811.

It is an arithmetic number, because the mean of its divisors is an integer number (3024343).

Almost surely, 2^11933821 is an apocalyptic number.

It is an amenable number.

11933821 is a deficient number, since it is larger than the sum of its proper divisors (163551).

11933821 is an equidigital number, since it uses as much as digits as its factorization.

11933821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163550.

The product of its digits is 1296, while the sum is 28.

The square root of 11933821 is about 3454.5362930501. The cubic root of 11933821 is about 228.5212055392.

The spelling of 11933821 in words is "eleven million, nine hundred thirty-three thousand, eight hundred twenty-one".