21366282 has 32 divisors (see below), whose sum is σ = 49089024. Its totient is φ = 6073200.

The previous prime is 21366281. The next prime is 21366311. The reversal of 21366282 is 28266312.

It is a super-3 number, since 3×21366282³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21366281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7657 + ... + 10067.

It is an arithmetic number, because the mean of its divisors is an integer number (1534032).

Almost surely, 2^21366282 is an apocalyptic number.

21366282 is an abundant number, since it is smaller than the sum of its proper divisors (27722742).

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

21366282 is a wasteful number, since it uses less digits than its factorization.

21366282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634.

The product of its digits is 6912, while the sum is 30.

The square root of 21366282 is about 4622.3675751718. The cubic root of 21366282 is about 277.4872196046.

Adding to 21366282 its sum of digits (30), we get a palindrome (21366312).

The spelling of 21366282 in words is "twenty-one million, three hundred sixty-six thousand, two hundred eighty-two".