21282272 has 48 divisors (see below), whose sum is σ = 46230912. Its totient is φ = 9563520.

The previous prime is 21282269. The next prime is 21282301. The reversal of 21282272 is 27228212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35963 + ... + 36549.

It is an arithmetic number, because the mean of its divisors is an integer number (963144).

Almost surely, 2^21282272 is an apocalyptic number.

21282272 is a gapful number since it is divisible by the number (22) 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 21282272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23115456).

21282272 is an abundant number, since it is smaller than the sum of its proper divisors (24948640).

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

21282272 is a wasteful number, since it uses less digits than its factorization.

21282272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711 (or 703 counting only the distinct ones).

The product of its digits is 1792, while the sum is 26.

The square root of 21282272 is about 4613.2712905269. The cubic root of 21282272 is about 277.1230582701.

The spelling of 21282272 in words is "twenty-one million, two hundred eighty-two thousand, two hundred seventy-two".