21548198448 has 160 divisors (see below), whose sum is σ = 72130304000. Its totient is φ = 6156585792.

The previous prime is 21548198401. The next prime is 21548198449. The reversal of 21548198448 is 84489184512.

21548198448 is a `hidden beast` number, since 2 + 1 + 5 + 4 + 8 + 198 + 448 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 21548198394 and 21548198403.

It is not an unprimeable number, because it can be changed into a prime (21548198449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75465 + ... + 220887.

It is an arithmetic number, because the mean of its divisors is an integer number (450814400).

Almost surely, 2^21548198448 is an apocalyptic number.

21548198448 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21548198448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36065152000).

21548198448 is an abundant number, since it is smaller than the sum of its proper divisors (50582105552).

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

21548198448 is a wasteful number, since it uses less digits than its factorization.

21548198448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145461 (or 145435 counting only the distinct ones).

The product of its digits is 2949120, while the sum is 54.

The spelling of 21548198448 in words is "twenty-one billion, five hundred forty-eight million, one hundred ninety-eight thousand, four hundred forty-eight".