21302496 has 144 divisors (see below), whose sum is σ = 67813200. Its totient is φ = 6303744.

The previous prime is 21302483. The next prime is 21302507. The reversal of 21302496 is 69420312.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92910 + ... + 93138.

It is an arithmetic number, because the mean of its divisors is an integer number (470925).

Almost surely, 2^21302496 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 21302496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33906600).

21302496 is an abundant number, since it is smaller than the sum of its proper divisors (46510704).

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

21302496 is a wasteful number, since it uses less digits than its factorization.

21302496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 270 counting only the distinct ones).

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

The square root of 21302496 is about 4615.4627070317. The cubic root of 21302496 is about 277.2108114697.

The spelling of 21302496 in words is "twenty-one million, three hundred two thousand, four hundred ninety-six".