21480264 has 96 divisors (see below), whose sum is σ = 63980280. Its totient is φ = 6469632.

The previous prime is 21480257. The next prime is 21480293. The reversal of 21480264 is 46208412.

It can be written as a sum of positive squares in 4 ways, for example, as 12659364 + 8820900 = 3558^2 + 2970^2 .

It is a super-2 number, since 2×21480264² = 922803483019392, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 49392 + ... + 49824.

Almost surely, 2^21480264 is an apocalyptic number.

21480264 is a gapful number since it is divisible by the number (24) 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 21480264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31990140).

21480264 is an abundant number, since it is smaller than the sum of its proper divisors (42500016).

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

21480264 is a wasteful number, since it uses less digits than its factorization.

21480264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511 (or 504 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 21480264 is about 4634.6805715173. The cubic root of 21480264 is about 277.9797787338.

Adding to 21480264 its reverse (46208412), we get a palindrome (67688676).

The spelling of 21480264 in words is "twenty-one million, four hundred eighty thousand, two hundred sixty-four".