21508050448 has 80 divisors (see below), whose sum is σ = 43969685760. Its totient is φ = 10177574400.

The previous prime is 21508050409. The next prime is 21508050527. The reversal of 21508050448 is 84405080512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5961061 + ... + 5964667.

It is an arithmetic number, because the mean of its divisors is an integer number (549621072).

Almost surely, 2^21508050448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21508050448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21984842880).

21508050448 is an abundant number, since it is smaller than the sum of its proper divisors (22461635312).

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

21508050448 is a wasteful number, since it uses less digits than its factorization.

21508050448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3896 (or 3890 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 37.

The spelling of 21508050448 in words is "twenty-one billion, five hundred eight million, fifty thousand, four hundred forty-eight".