21036480 has 112 divisors (see below), whose sum is σ = 70774560. Its totient is φ = 5275648.

The previous prime is 21036479. The next prime is 21036481. The reversal of 21036480 is 8463012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21036479) and next prime (21036481).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21036480.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21036481) 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, 15676 + ... + 16964.

Almost surely, 2^21036480 is an apocalyptic number.

21036480 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 21036480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35387280).

21036480 is an abundant number, since it is smaller than the sum of its proper divisors (49738080).

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

21036480 is a wasteful number, since it uses less digits than its factorization.

21036480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326 (or 1316 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21036480 is about 4586.5542621886. The cubic root of 21036480 is about 276.0520800692.

Adding to 21036480 its reverse (8463012), we get a palindrome (29499492).

The spelling of 21036480 in words is "twenty-one million, thirty-six thousand, four hundred eighty".