21306096 has 120 divisors (see below), whose sum is σ = 71185920. Its totient is φ = 5816448.

The previous prime is 21306091. The next prime is 21306143. The reversal of 21306096 is 69060312.

It is a happy number.

21306096 is a `hidden beast` number, since 21 + 30 + 609 + 6 = 666.

It is a super-2 number, since 2×21306096² = 907899453522432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21306091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22725 + ... + 23643.

It is an arithmetic number, because the mean of its divisors is an integer number (593216).

Almost surely, 2^21306096 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 21306096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35592960).

21306096 is an abundant number, since it is smaller than the sum of its proper divisors (49879824).

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

21306096 is a wasteful number, since it uses less digits than its factorization.

21306096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963 (or 954 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 21306096 is about 4615.8526839578. The cubic root of 21306096 is about 277.2264262707.

The spelling of 21306096 in words is "twenty-one million, three hundred six thousand, ninety-six".