21415296 has 128 divisors (see below), whose sum is σ = 67368960. Its totient is φ = 5898240.

The previous prime is 21415249. The next prime is 21415307. The reversal of 21415296 is 69251412.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×21415296² = 917229805535232, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83200 + ... + 83456.

It is an arithmetic number, because the mean of its divisors is an integer number (526320).

Almost surely, 2^21415296 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 21415296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33684480).

21415296 is an abundant number, since it is smaller than the sum of its proper divisors (45953664).

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

21415296 is a wasteful number, since it uses less digits than its factorization.

21415296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312 (or 300 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 21415296 is about 4627.6663665394. Note that the first 3 decimals coincide. The cubic root of 21415296 is about 277.6992417028.

The spelling of 21415296 in words is "twenty-one million, four hundred fifteen thousand, two hundred ninety-six".