11603821 has 2 divisors, whose sum is σ = 11603822. Its totient is φ = 11603820.

The previous prime is 11603791. The next prime is 11603833. The reversal of 11603821 is 12830611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6812100 + 4791721 = 2610^2 + 2189^2 .

It is a cyclic number.

It is not a de Polignac number, because 11603821 - 2⁷ = 11603693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11603792 and 11603801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11603881) 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 as a sum of consecutive naturals, namely, 5801910 + 5801911.

It is an arithmetic number, because the mean of its divisors is an integer number (5801911).

Almost surely, 2^11603821 is an apocalyptic number.

It is an amenable number.

11603821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11603821 is an equidigital number, since it uses as much as digits as its factorization.

11603821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 11603821 is about 3406.4381691145. The cubic root of 11603821 is about 226.3950916561.

The spelling of 11603821 in words is "eleven million, six hundred three thousand, eight hundred twenty-one".