21328699392 has 1008 divisors, whose sum is σ = 87876839232. Its totient is φ = 4812963840.

The previous prime is 21328699363. The next prime is 21328699393. The reversal of 21328699392 is 29399682312.

It is a tau number, because it is divible by the number of its divisors (1008).

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

It is not an unprimeable number, because it can be changed into a prime (21328699393) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1254629368 + ... + 1254629384.

It is an arithmetic number, because the mean of its divisors is an integer number (87179404).

Almost surely, 2^21328699392 is an apocalyptic number.

21328699392 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21328699392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43938419616).

21328699392 is an abundant number, since it is smaller than the sum of its proper divisors (66548139840).

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

21328699392 is a wasteful number, since it uses less digits than its factorization.

21328699392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 53 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The spelling of 21328699392 in words is "twenty-one billion, three hundred twenty-eight million, six hundred ninety-nine thousand, three hundred ninety-two".