19291821047 has 2 divisors, whose sum is σ = 19291821048. Its totient is φ = 19291821046.

The previous prime is 19291821013. The next prime is 19291821077. The reversal of 19291821047 is 74012819291.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19291821047 - 2¹⁸ = 19291558903 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19291820989 and 19291821007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19291821007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9645910523 + 9645910524.

It is an arithmetic number, because the mean of its divisors is an integer number (9645910524).

Almost surely, 2^19291821047 is an apocalyptic number.

19291821047 is a deficient number, since it is larger than the sum of its proper divisors (1).

19291821047 is an equidigital number, since it uses as much as digits as its factorization.

19291821047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 44.

The spelling of 19291821047 in words is "nineteen billion, two hundred ninety-one million, eight hundred twenty-one thousand, forty-seven".