21262848 has 80 divisors (see below), whose sum is σ = 57615360. Its totient is φ = 6967296.

The previous prime is 21262841. The next prime is 21262849. The reversal of 21262848 is 84826212.

It is a happy number.

It is a super-2 number, since 2×21262848² = 904217410142208, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21262841) 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 7 ways as a sum of consecutive naturals, for example, 167361 + ... + 167487.

It is an arithmetic number, because the mean of its divisors is an integer number (720192).

Almost surely, 2^21262848 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 21262848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28807680).

21262848 is an abundant number, since it is smaller than the sum of its proper divisors (36352512).

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

21262848 is a wasteful number, since it uses less digits than its factorization.

21262848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 241 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

The square root of 21262848 is about 4611.1655793302. The cubic root of 21262848 is about 277.0387239671.

The spelling of 21262848 in words is "twenty-one million, two hundred sixty-two thousand, eight hundred forty-eight".