21604077088 has 144 divisors (see below), whose sum is σ = 50232135744. Its totient is φ = 9065738240.

The previous prime is 21604077083. The next prime is 21604077127. The reversal of 21604077088 is 88077040612.

It is a super-2 number, since 2×21604077088² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21604077083) 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 23 ways as a sum of consecutive naturals, for example, 5389581 + ... + 5393587.

It is an arithmetic number, because the mean of its divisors is an integer number (348834276).

Almost surely, 2^21604077088 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 21604077088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25116067872).

21604077088 is an abundant number, since it is smaller than the sum of its proper divisors (28628058656).

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

21604077088 is a wasteful number, since it uses less digits than its factorization.

21604077088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4115 (or 4090 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 43.

The spelling of 21604077088 in words is "twenty-one billion, six hundred four million, seventy-seven thousand, eighty-eight".