21345282 has 60 divisors (see below), whose sum is σ = 55658790. Its totient is φ = 6096384.

The previous prime is 21345277. The next prime is 21345283. The reversal of 21345282 is 28254312.

21345282 is a `hidden beast` number, since 2 + 134 + 528 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21150801 + 194481 = 4599^2 + 441^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21345283) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 6594 + ... + 9282.

Almost surely, 2^21345282 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21345282, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27829395).

21345282 is an abundant number, since it is smaller than the sum of its proper divisors (34313508).

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

21345282 is a wasteful number, since it uses less digits than its factorization.

21345282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717 (or 2701 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21345282 is about 4620.0954535594. The cubic root of 21345282 is about 277.3962797183.

Adding to 21345282 its reverse (28254312), we get a palindrome (49599594).

The spelling of 21345282 in words is "twenty-one million, three hundred forty-five thousand, two hundred eighty-two".