21489498936 has 96 divisors (see below), whose sum is σ = 60942860160. Its totient is φ = 7093554912.

The previous prime is 21489498913. The next prime is 21489498937. The reversal of 21489498936 is 63989498412.

21489498936 is a `hidden beast` number, since 2 + 1 + 489 + 49 + 89 + 36 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21489498937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146571 + ... + 253893.

It is an arithmetic number, because the mean of its divisors is an integer number (634821460).

Almost surely, 2^21489498936 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 21489498936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30471430080).

21489498936 is an abundant number, since it is smaller than the sum of its proper divisors (39453361224).

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

21489498936 is a wasteful number, since it uses less digits than its factorization.

21489498936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107447 (or 107431 counting only the distinct ones).

The product of its digits is 26873856, while the sum is 63.

The spelling of 21489498936 in words is "twenty-one billion, four hundred eighty-nine million, four hundred ninety-eight thousand, nine hundred thirty-six".