21676698432 has 168 divisors, whose sum is σ = 63318676512. Its totient is φ = 7088256000.

The previous prime is 21676698431. The next prime is 21676698443. The reversal of 21676698432 is 23489667612.

21676698432 is a `hidden beast` number, since 2 + 1 + 67 + 66 + 98 + 432 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676698431) 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, 20624307 + ... + 20625357.

It is an arithmetic number, because the mean of its divisors is an integer number (376896884).

Almost surely, 2^21676698432 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 21676698432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31659338256).

21676698432 is an abundant number, since it is smaller than the sum of its proper divisors (41641978080).

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

21676698432 is a wasteful number, since it uses less digits than its factorization.

21676698432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1717 (or 1704 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The spelling of 21676698432 in words is "twenty-one billion, six hundred seventy-six million, six hundred ninety-eight thousand, four hundred thirty-two".