19021048081 has 4 divisors (see below), whose sum is σ = 21738340672. Its totient is φ = 16303755492.

The previous prime is 19021048073. The next prime is 19021048087. The reversal of 19021048081 is 18084012091.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19021048081 - 2³ = 19021048073 is a prime.

It is a super-2 number, since 2×19021048081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19021048087) 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 in 3 ways as a sum of consecutive naturals, for example, 1358646285 + ... + 1358646298.

It is an arithmetic number, because the mean of its divisors is an integer number (5434585168).

Almost surely, 2^19021048081 is an apocalyptic number.

It is an amenable number.

19021048081 is a deficient number, since it is larger than the sum of its proper divisors (2717292591).

19021048081 is an equidigital number, since it uses as much as digits as its factorization.

19021048081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717292590.

The product of its (nonzero) digits is 4608, while the sum is 34.

The spelling of 19021048081 in words is "nineteen billion, twenty-one million, forty-eight thousand, eighty-one".