21236163120 has 320 divisors, whose sum is σ = 78794956800. Its totient is φ = 5241646080.

The previous prime is 21236163103. The next prime is 21236163127. The reversal of 21236163120 is 2136163212.

21236163120 is a `hidden beast` number, since 2 + 1 + 2 + 3 + 6 + 1 + 631 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21236163127) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1533186 + ... + 1546974.

It is an arithmetic number, because the mean of its divisors is an integer number (246234240).

Almost surely, 2^21236163120 is an apocalyptic number.

21236163120 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 21236163120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39397478400).

21236163120 is an abundant number, since it is smaller than the sum of its proper divisors (57558793680).

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

21236163120 is a wasteful number, since it uses less digits than its factorization.

21236163120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13865 (or 13853 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The spelling of 21236163120 in words is "twenty-one billion, two hundred thirty-six million, one hundred sixty-three thousand, one hundred twenty".