21798533376 has 180 divisors, whose sum is σ = 67098011904. Its totient is φ = 7031577600.

The previous prime is 21798533371. The next prime is 21798533411. The reversal of 21798533376 is 67333589712.

21798533376 is a `hidden beast` number, since 2 + 1 + 79 + 8 + 533 + 37 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (21798533371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 625861 + ... + 659771.

Almost surely, 2^21798533376 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 21798533376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33549005952).

21798533376 is an abundant number, since it is smaller than the sum of its proper divisors (45299478528).

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

21798533376 is an equidigital number, since it uses as much as digits as its factorization.

21798533376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33970 (or 33947 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 54.

The spelling of 21798533376 in words is "twenty-one billion, seven hundred ninety-eight million, five hundred thirty-three thousand, three hundred seventy-six".