19080421 has 2 divisors, whose sum is σ = 19080422. Its totient is φ = 19080420.

The previous prime is 19080403. The next prime is 19080431. The reversal of 19080421 is 12408091.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11296321 + 7784100 = 3361^2 + 2790^2 .

It is a cyclic number.

It is not a de Polignac number, because 19080421 - 2¹¹ = 19078373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19080431) 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, 9540210 + 9540211.

It is an arithmetic number, because the mean of its divisors is an integer number (9540211).

Almost surely, 2^19080421 is an apocalyptic number.

It is an amenable number.

19080421 is a deficient number, since it is larger than the sum of its proper divisors (1).

19080421 is an equidigital number, since it uses as much as digits as its factorization.

19080421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 19080421 is about 4368.1141239670. The cubic root of 19080421 is about 267.2161183235.

The spelling of 19080421 in words is "nineteen million, eighty thousand, four hundred twenty-one".