19421809548 has 24 divisors (see below), whose sum is σ = 45327347520. Its totient is φ = 6472537680.

The previous prime is 19421809543. The next prime is 19421809591. The reversal of 19421809548 is 84590812491.

It is a super-2 number, since 2×19421809548² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19421809548.

It is not an unprimeable number, because it can be changed into a prime (19421809543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116218 + ... + 228801.

It is an arithmetic number, because the mean of its divisors is an integer number (1888639480).

Almost surely, 2^19421809548 is an apocalyptic number.

It is an amenable number.

19421809548 is an abundant number, since it is smaller than the sum of its proper divisors (25905537972).

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

19421809548 is a wasteful number, since it uses less digits than its factorization.

19421809548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349717 (or 349715 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 51.

The spelling of 19421809548 in words is "nineteen billion, four hundred twenty-one million, eight hundred nine thousand, five hundred forty-eight".