21096309936 has 160 divisors (see below), whose sum is σ = 62382882240. Its totient is φ = 6085804032.

The previous prime is 21096309917. The next prime is 21096309959. The reversal of 21096309936 is 63990369012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2849856 + ... + 2857248.

It is an arithmetic number, because the mean of its divisors is an integer number (389893014).

Almost surely, 2^21096309936 is an apocalyptic number.

21096309936 is a gapful number since it is divisible by the number (26) 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 21096309936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31191441120).

21096309936 is an abundant number, since it is smaller than the sum of its proper divisors (41286572304).

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

21096309936 is a wasteful number, since it uses less digits than its factorization.

21096309936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7703 (or 7697 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 48.

The spelling of 21096309936 in words is "twenty-one billion, ninety-six million, three hundred nine thousand, nine hundred thirty-six".