19488254921 has 2 divisors, whose sum is σ = 19488254922. Its totient is φ = 19488254920.

The previous prime is 19488254917. The next prime is 19488254971. The reversal of 19488254921 is 12945288491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16988254921 + 2500000000 = 130339^2 + 50000^2 .

It is an emirp because it is prime and its reverse (12945288491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19488254921 - 2² = 19488254917 is a prime.

It is not a weakly prime, because it can be changed into another prime (19488254911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9744127460 + 9744127461.

It is an arithmetic number, because the mean of its divisors is an integer number (9744127461).

Almost surely, 2^19488254921 is an apocalyptic number.

It is an amenable number.

19488254921 is a deficient number, since it is larger than the sum of its proper divisors (1).

19488254921 is an equidigital number, since it uses as much as digits as its factorization.

19488254921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1658880, while the sum is 53.

The spelling of 19488254921 in words is "nineteen billion, four hundred eighty-eight million, two hundred fifty-four thousand, nine hundred twenty-one".