21596040000 has 420 divisors, whose sum is σ = 77984786880. Its totient is φ = 5712000000.

The previous prime is 21596039989. The next prime is 21596040001. The reversal of 21596040000 is 4069512.

21596040000 is a `hidden beast` number, since 2 + 1 + 59 + 604 + 0 + 0 + 0 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21596040001) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 86039875 + ... + 86040125.

It is an arithmetic number, because the mean of its divisors is an integer number (185678064).

Almost surely, 2^21596040000 is an apocalyptic number.

21596040000 is a gapful number since it is divisible by the number (20) 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 21596040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38992393440).

21596040000 is an abundant number, since it is smaller than the sum of its proper divisors (56388746880).

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

21596040000 is a wasteful number, since it uses less digits than its factorization.

21596040000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The spelling of 21596040000 in words is "twenty-one billion, five hundred ninety-six million, forty thousand".