11919421 has 2 divisors, whose sum is σ = 11919422. Its totient is φ = 11919420.

The previous prime is 11919379. The next prime is 11919437. The reversal of 11919421 is 12491911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7344100 + 4575321 = 2710^2 + 2139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11919421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11919421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11919491) 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, 5959710 + 5959711.

It is an arithmetic number, because the mean of its divisors is an integer number (5959711).

Almost surely, 2^11919421 is an apocalyptic number.

It is an amenable number.

11919421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11919421 is an equidigital number, since it uses as much as digits as its factorization.

11919421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 28.

The square root of 11919421 is about 3452.4514478845. The cubic root of 11919421 is about 228.4292531564.

The spelling of 11919421 in words is "eleven million, nine hundred nineteen thousand, four hundred twenty-one".