11131921 has 2 divisors, whose sum is σ = 11131922. Its totient is φ = 11131920.

The previous prime is 11131907. The next prime is 11131927. The reversal of 11131921 is 12913111.

11131921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11128896 + 3025 = 3336^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 11131921 - 2⁹ = 11131409 is a prime.

It is not a weakly prime, because it can be changed into another prime (11131927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5565960 + 5565961.

It is an arithmetic number, because the mean of its divisors is an integer number (5565961).

Almost surely, 2^11131921 is an apocalyptic number.

It is an amenable number.

11131921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11131921 is an equidigital number, since it uses as much as digits as its factorization.

11131921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54, while the sum is 19.

The square root of 11131921 is about 3336.4533564850. The cubic root of 11131921 is about 223.2835380679.

The spelling of 11131921 in words is "eleven million, one hundred thirty-one thousand, nine hundred twenty-one".