21269248 has 144 divisors (see below), whose sum is σ = 57689856. Its totient is φ = 7557120.

The previous prime is 21269243. The next prime is 21269251. The reversal of 21269248 is 84296212.

It is not an unprimeable number, because it can be changed into a prime (21269243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256215 + ... + 256297.

It is an arithmetic number, because the mean of its divisors is an integer number (400624).

Almost surely, 2^21269248 is an apocalyptic number.

21269248 is a gapful number since it is divisible by the number (28) 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 21269248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28844928).

21269248 is an abundant number, since it is smaller than the sum of its proper divisors (36420608).

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

21269248 is a wasteful number, since it uses less digits than its factorization.

21269248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 116 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 21269248 is about 4611.8594948242. The cubic root of 21269248 is about 277.0665168882.

The spelling of 21269248 in words is "twenty-one million, two hundred sixty-nine thousand, two hundred forty-eight".