11143921 has 2 divisors, whose sum is σ = 11143922. Its totient is φ = 11143920.

The previous prime is 11143903. The next prime is 11143931. The reversal of 11143921 is 12934111.

11143921 = 2360² + 2361².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5574321 + 5569600 = 2361^2 + 2360^2 .

It is a cyclic number.

It is not a de Polignac number, because 11143921 - 2⁵ = 11143889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11143892 and 11143901.

It is not a weakly prime, because it can be changed into another prime (11143901) 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, 5571960 + 5571961.

It is an arithmetic number, because the mean of its divisors is an integer number (5571961).

Almost surely, 2^11143921 is an apocalyptic number.

11143921 is the 2361-st centered square number.

It is an amenable number.

11143921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11143921 is an equidigital number, since it uses as much as digits as its factorization.

11143921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 22.

The square root of 11143921 is about 3338.2511888712. The cubic root of 11143921 is about 223.3637410640.

The spelling of 11143921 in words is "eleven million, one hundred forty-three thousand, nine hundred twenty-one".