21236750496 has 144 divisors (see below), whose sum is σ = 65146372200. Its totient is φ = 6523453440.

The previous prime is 21236750467. The next prime is 21236750531. The reversal of 21236750496 is 69405763212.

21236750496 is a `hidden beast` number, since 21 + 2 + 36 + 7 + 504 + 96 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 11916778896 + 9319971600 = 109164^2 + 96540^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2395480 + ... + 2404328.

Almost surely, 2^21236750496 is an apocalyptic number.

21236750496 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 21236750496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32573186100).

21236750496 is an abundant number, since it is smaller than the sum of its proper divisors (43909621704).

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

21236750496 is a wasteful number, since it uses less digits than its factorization.

21236750496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9519 (or 9508 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 21236750496 in words is "twenty-one billion, two hundred thirty-six million, seven hundred fifty thousand, four hundred ninety-six".