21283296 has 48 divisors (see below), whose sum is σ = 56652624. Its totient is φ = 6994944.

The previous prime is 21283291. The next prime is 21283307. The reversal of 21283296 is 69238212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21283291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5490 + ... + 8526.

It is an arithmetic number, because the mean of its divisors is an integer number (1180263).

Almost surely, 2^21283296 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 21283296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28326312).

21283296 is an abundant number, since it is smaller than the sum of its proper divisors (35369328).

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

21283296 is a wasteful number, since it uses less digits than its factorization.

21283296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3123 (or 3115 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 21283296 is about 4613.3822733435. The cubic root of 21283296 is about 277.1275028059.

The spelling of 21283296 in words is "twenty-one million, two hundred eighty-three thousand, two hundred ninety-six".