19151242321 has 2 divisors, whose sum is σ = 19151242322. Its totient is φ = 19151242320.

The previous prime is 19151242213. The next prime is 19151242333. The reversal of 19151242321 is 12324215191.

Together with previous prime (19151242213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15963059025 + 3188183296 = 126345^2 + 56464^2 .

It is an emirp because it is prime and its reverse (12324215191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19151242321 is a prime.

It is a super-2 number, since 2×19151242321² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19151242381) 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, 9575621160 + 9575621161.

It is an arithmetic number, because the mean of its divisors is an integer number (9575621161).

Almost surely, 2^19151242321 is an apocalyptic number.

It is an amenable number.

19151242321 is a deficient number, since it is larger than the sum of its proper divisors (1).

19151242321 is an equidigital number, since it uses as much as digits as its factorization.

19151242321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The spelling of 19151242321 in words is "nineteen billion, one hundred fifty-one million, two hundred forty-two thousand, three hundred twenty-one".