21135296 has 112 divisors (see below), whose sum is σ = 54620160. Its totient is φ = 7879680.

The previous prime is 21135293. The next prime is 21135311. The reversal of 21135296 is 69253112.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21135293) 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, 110561 + ... + 110751.

It is an arithmetic number, because the mean of its divisors is an integer number (487680).

Almost surely, 2^21135296 is an apocalyptic number.

21135296 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 21135296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27310080).

21135296 is an abundant number, since it is smaller than the sum of its proper divisors (33484864).

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

21135296 is a wasteful number, since it uses less digits than its factorization.

21135296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 232 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

The square root of 21135296 is about 4597.3139984126. The cubic root of 21135296 is about 276.4836440528.

The spelling of 21135296 in words is "twenty-one million, one hundred thirty-five thousand, two hundred ninety-six".