21351360 has 112 divisors (see below), whose sum is σ = 70811136. Its totient is φ = 5440512.

The previous prime is 21351353. The next prime is 21351361. The reversal of 21351360 is 6315312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21351361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21597 + ... + 22563.

Almost surely, 2^21351360 is an apocalyptic number.

21351360 is a gapful number since it is divisible by the number (20) 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 21351360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35405568).

21351360 is an abundant number, since it is smaller than the sum of its proper divisors (49459776).

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

21351360 is a wasteful number, since it uses less digits than its factorization.

21351360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010 (or 1000 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 21351360 is about 4620.7531853584. The cubic root of 21351360 is about 277.4226064507.

Adding to 21351360 its reverse (6315312), we get a palindrome (27666672).

The spelling of 21351360 in words is "twenty-one million, three hundred fifty-one thousand, three hundred sixty".