21169896 has 128 divisors (see below), whose sum is σ = 62985600. Its totient is φ = 5857280.

The previous prime is 21169891. The next prime is 21169909. The reversal of 21169896 is 69896112.

It is not an unprimeable number, because it can be changed into a prime (21169891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 237820 + ... + 237908.

It is an arithmetic number, because the mean of its divisors is an integer number (492075).

Almost surely, 2^21169896 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 21169896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31492800).

21169896 is an abundant number, since it is smaller than the sum of its proper divisors (41815704).

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

21169896 is a wasteful number, since it uses less digits than its factorization.

21169896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 175 counting only the distinct ones).

The product of its digits is 46656, while the sum is 42.

The square root of 21169896 is about 4601.0755264394. The cubic root of 21169896 is about 276.6344363351.

It can be divided in two parts, 211 and 69896, that added together give a palindrome (70107).

The spelling of 21169896 in words is "twenty-one million, one hundred sixty-nine thousand, eight hundred ninety-six".