19207122005 has 4 divisors (see below), whose sum is σ = 23048546412. Its totient is φ = 15365697600.

The previous prime is 19207121977. The next prime is 19207122007. The reversal of 19207122005 is 50022170291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50022170291 = 79 ⋅633192029.

It can be written as a sum of positive squares in 2 ways, for example, as 14051020369 + 5156101636 = 118537^2 + 71806^2 .

It is not a de Polignac number, because 19207122005 - 2¹⁶ = 19207056469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19207122007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1920712196 + ... + 1920712205.

It is an arithmetic number, because the mean of its divisors is an integer number (5762136603).

Almost surely, 2^19207122005 is an apocalyptic number.

It is an amenable number.

19207122005 is a deficient number, since it is larger than the sum of its proper divisors (3841424407).

19207122005 is an equidigital number, since it uses as much as digits as its factorization.

19207122005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3841424406.

The product of its (nonzero) digits is 2520, while the sum is 29.

Adding to 19207122005 its reverse (50022170291), we get a palindrome (69229292296).

The spelling of 19207122005 in words is "nineteen billion, two hundred seven million, one hundred twenty-two thousand, five".