19427321 has 2 divisors, whose sum is σ = 19427322. Its totient is φ = 19427320.

The previous prime is 19427293. The next prime is 19427327. The reversal of 19427321 is 12372491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12996025 + 6431296 = 3605^2 + 2536^2 .

It is a cyclic number.

It is not a de Polignac number, because 19427321 - 2¹⁸ = 19165177 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19427327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9713660 + 9713661.

It is an arithmetic number, because the mean of its divisors is an integer number (9713661).

Almost surely, 2^19427321 is an apocalyptic number.

It is an amenable number.

19427321 is a deficient number, since it is larger than the sum of its proper divisors (1).

19427321 is an equidigital number, since it uses as much as digits as its factorization.

19427321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 29.

The square root of 19427321 is about 4407.6434746926. The cubic root of 19427321 is about 268.8258155670.

The spelling of 19427321 in words is "nineteen million, four hundred twenty-seven thousand, three hundred twenty-one".