21136896 has 160 divisors (see below), whose sum is σ = 68745600. Its totient is φ = 6359040.

The previous prime is 21136891. The next prime is 21136903. The reversal of 21136896 is 69863112.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21136896.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21136891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151995 + ... + 152133.

It is an arithmetic number, because the mean of its divisors is an integer number (429660).

Almost surely, 2^21136896 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21136896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34372800).

21136896 is an abundant number, since it is smaller than the sum of its proper divisors (47608704).

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

21136896 is a wasteful number, since it uses less digits than its factorization.

21136896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 155 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 21136896 is about 4597.4880097723. The cubic root of 21136896 is about 276.4906207340.

It can be divided in two parts, 2113 and 6896, that added together give a palindrome (9009).

The spelling of 21136896 in words is "twenty-one million, one hundred thirty-six thousand, eight hundred ninety-six".