11719021 has 2 divisors, whose sum is σ = 11719022. Its totient is φ = 11719020.

The previous prime is 11719013. The next prime is 11719049. The reversal of 11719021 is 12091711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11634921 + 84100 = 3411^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 11719021 - 2³ = 11719013 is a prime.

It is equal to p₇₇₀₈₀₀ and since 11719021 and 770800 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 11718983 and 11719001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11719051) 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, 5859510 + 5859511.

It is an arithmetic number, because the mean of its divisors is an integer number (5859511).

Almost surely, 2^11719021 is an apocalyptic number.

It is an amenable number.

11719021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11719021 is an equidigital number, since it uses as much as digits as its factorization.

11719021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 22.

The square root of 11719021 is about 3423.3055662619. The cubic root of 11719021 is about 227.1418249872.

The spelling of 11719021 in words is "eleven million, seven hundred nineteen thousand, twenty-one".