11924821 has 2 divisors, whose sum is σ = 11924822. Its totient is φ = 11924820.

The previous prime is 11924789. The next prime is 11924827. The reversal of 11924821 is 12842911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7980625 + 3944196 = 2825^2 + 1986^2 .

It is a cyclic number.

It is not a de Polignac number, because 11924821 - 2⁵ = 11924789 is a prime.

It is equal to p₇₈₃₄₂₄ and since 11924821 and 783424 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11924821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11924827) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5962410 + 5962411.

It is an arithmetic number, because the mean of its divisors is an integer number (5962411).

Almost surely, 2^11924821 is an apocalyptic number.

It is an amenable number.

11924821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11924821 is an equidigital number, since it uses as much as digits as its factorization.

11924821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 28.

The square root of 11924821 is about 3453.2334123253. The cubic root of 11924821 is about 228.4637439742.

The spelling of 11924821 in words is "eleven million, nine hundred twenty-four thousand, eight hundred twenty-one".