21596923139520 has 896 divisors, whose sum is σ = 74884567080960. Its totient is φ = 5259743723520.

The previous prime is 21596923139471. The next prime is 21596923139527. The reversal of 21596923139520 is 2593132969512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21596923139527) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6924308521 + ... + 6924311639.

It is an arithmetic number, because the mean of its divisors is an integer number (83576525760).

Almost surely, 2^{21596923139520} is an apocalyptic number.

21596923139520 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 21596923139520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37442283540480).

21596923139520 is an abundant number, since it is smaller than the sum of its proper divisors (53287643941440).

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

21596923139520 is a wasteful number, since it uses less digits than its factorization.

21596923139520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3373 (or 3363 counting only the distinct ones).

The product of its (nonzero) digits is 7873200, while the sum is 57.

The spelling of 21596923139520 in words is "twenty-one trillion, five hundred ninety-six billion, nine hundred twenty-three million, one hundred thirty-nine thousand, five hundred twenty".