21598445120 has 224 divisors, whose sum is σ = 60608382720. Its totient is φ = 7176314880.

The previous prime is 21598445093. The next prime is 21598445161. The reversal of 21598445120 is 2154489512.

It is a tau number, because it is divible by the number of its divisors (224).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34892171 + ... + 34892789.

Almost surely, 2^21598445120 is an apocalyptic number.

21598445120 is a gapful number since it is divisible by the number (20) 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 21598445120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30304191360).

21598445120 is an abundant number, since it is smaller than the sum of its proper divisors (39009937600).

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

21598445120 is a wasteful number, since it uses less digits than its factorization.

21598445120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101 (or 1091 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 41.

The spelling of 21598445120 in words is "twenty-one billion, five hundred ninety-eight million, four hundred forty-five thousand, one hundred twenty".