21598428108 has 24 divisors (see below), whose sum is σ = 50398972848. Its totient is φ = 7199098816.

The previous prime is 21598428043. The next prime is 21598428143. The reversal of 21598428108 is 80182489512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285010 + ... + 352742.

It is an arithmetic number, because the mean of its divisors is an integer number (2099957202).

Almost surely, 2^21598428108 is an apocalyptic number.

It is an amenable number.

21598428108 is an abundant number, since it is smaller than the sum of its proper divisors (28800544740).

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

21598428108 is a wasteful number, since it uses less digits than its factorization.

21598428108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94313 (or 94311 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 48.

The spelling of 21598428108 in words is "twenty-one billion, five hundred ninety-eight million, four hundred twenty-eight thousand, one hundred eight".