19482728921 has 2 divisors, whose sum is σ = 19482728922. Its totient is φ = 19482728920.

The previous prime is 19482728899. The next prime is 19482728983. The reversal of 19482728921 is 12982728491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13130638921 + 6352090000 = 114589^2 + 79700^2 .

It is an emirp because it is prime and its reverse (12982728491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19482728921 - 2⁶ = 19482728857 is a prime.

It is not a weakly prime, because it can be changed into another prime (19482722921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9741364460 + 9741364461.

It is an arithmetic number, because the mean of its divisors is an integer number (9741364461).

Almost surely, 2^19482728921 is an apocalyptic number.

It is an amenable number.

19482728921 is a deficient number, since it is larger than the sum of its proper divisors (1).

19482728921 is an equidigital number, since it uses as much as digits as its factorization.

19482728921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 53.

The spelling of 19482728921 in words is "nineteen billion, four hundred eighty-two million, seven hundred twenty-eight thousand, nine hundred twenty-one".