21336480 has 192 divisors, whose sum is σ = 81648000. Its totient is φ = 5160960.

The previous prime is 21336473. The next prime is 21336503. The reversal of 21336480 is 8463312.

It is a happy number.

21336480 is a `hidden beast` number, since 2 + 13 + 3 + 648 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47296 + ... + 47744.

It is an arithmetic number, because the mean of its divisors is an integer number (425250).

Almost surely, 2^21336480 is an apocalyptic number.

21336480 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 21336480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40824000).

21336480 is an abundant number, since it is smaller than the sum of its proper divisors (60311520).

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

21336480 is a wasteful number, since it uses less digits than its factorization.

21336480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 21336480 is about 4619.1427776158. The cubic root of 21336480 is about 277.3581451749.

Adding to 21336480 its reverse (8463312), we get a palindrome (29799792).

It can be divided in two parts, 213364 and 80, that added together give a square (213444 = 462²).

The spelling of 21336480 in words is "twenty-one million, three hundred thirty-six thousand, four hundred eighty".