11825821 has 8 divisors (see below), whose sum is σ = 13546880. Its totient is φ = 10112688.

The previous prime is 11825797. The next prime is 11825833. The reversal of 11825821 is 12852811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11825821 - 2⁹ = 11825309 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 11825821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11825851) 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 7 ways as a sum of consecutive naturals, for example, 1675 + ... + 5143.

It is an arithmetic number, because the mean of its divisors is an integer number (1693360).

Almost surely, 2^11825821 is an apocalyptic number.

It is an amenable number.

11825821 is a deficient number, since it is larger than the sum of its proper divisors (1721059).

11825821 is an equidigital number, since it uses as much as digits as its factorization.

11825821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3963.

The product of its digits is 1280, while the sum is 28.

The square root of 11825821 is about 3438.8691455186. The cubic root of 11825821 is about 227.8297500459.

The spelling of 11825821 in words is "eleven million, eight hundred twenty-five thousand, eight hundred twenty-one".