19028221 has 2 divisors, whose sum is σ = 19028222. Its totient is φ = 19028220.

The previous prime is 19028189. The next prime is 19028227. The reversal of 19028221 is 12282091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14907321 + 4120900 = 3861^2 + 2030^2 .

It is a cyclic number.

It is not a de Polignac number, because 19028221 - 2⁵ = 19028189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19028227) 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, 9514110 + 9514111.

It is an arithmetic number, because the mean of its divisors is an integer number (9514111).

Almost surely, 2^19028221 is an apocalyptic number.

It is an amenable number.

19028221 is a deficient number, since it is larger than the sum of its proper divisors (1).

19028221 is an equidigital number, since it uses as much as digits as its factorization.

19028221 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 19028221 is about 4362.1349130901. The cubic root of 19028221 is about 266.9722134858.

The spelling of 19028221 in words is "nineteen million, twenty-eight thousand, two hundred twenty-one".