21480396 has 96 divisors (see below), whose sum is σ = 60469248. Its totient is φ = 5806080.

The previous prime is 21480391. The next prime is 21480397. The reversal of 21480396 is 69308412.

It is a super-2 number, since 2×21480396² = 922814824633632, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21480391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190036 + ... + 190148.

It is an arithmetic number, because the mean of its divisors is an integer number (629888).

Almost surely, 2^21480396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21480396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30234624).

21480396 is an abundant number, since it is smaller than the sum of its proper divisors (38988852).

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

21480396 is a wasteful number, since it uses less digits than its factorization.

21480396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 229 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 21480396 is about 4634.6948119590. The cubic root of 21480396 is about 277.9803481442.

The spelling of 21480396 in words is "twenty-one million, four hundred eighty thousand, three hundred ninety-six".