19147821048 has 24 divisors (see below), whose sum is σ = 51858682200. Its totient is φ = 6382606992.

The previous prime is 19147821023. The next prime is 19147821059. The reversal of 19147821048 is 84012874191.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 19147820994 and 19147821012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 132970908 + ... + 132971051.

It is an arithmetic number, because the mean of its divisors is an integer number (2160778425).

Almost surely, 2^19147821048 is an apocalyptic number.

19147821048 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19147821048 is an abundant number, since it is smaller than the sum of its proper divisors (32710861152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19147821048 is a wasteful number, since it uses less digits than its factorization.

19147821048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265941971 (or 265941964 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The spelling of 19147821048 in words is "nineteen billion, one hundred forty-seven million, eight hundred twenty-one thousand, forty-eight".