21598131336 has 96 divisors (see below), whose sum is σ = 55313160000. Its totient is φ = 7027667712.

The previous prime is 21598131329. The next prime is 21598131341. The reversal of 21598131336 is 63313189512.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15437565 + ... + 15438963.

It is an arithmetic number, because the mean of its divisors is an integer number (576178750).

Almost surely, 2^21598131336 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 21598131336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27656580000).

21598131336 is an abundant number, since it is smaller than the sum of its proper divisors (33715028664).

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

21598131336 is a wasteful number, since it uses less digits than its factorization.

21598131336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743 (or 1686 counting only the distinct ones).

The product of its digits is 116640, while the sum is 42.

The spelling of 21598131336 in words is "twenty-one billion, five hundred ninety-eight million, one hundred thirty-one thousand, three hundred thirty-six".