21496480 has 24 divisors (see below), whose sum is σ = 50785812. Its totient is φ = 8598528.

The previous prime is 21496463. The next prime is 21496493. The reversal of 21496480 is 8469412.

It can be written as a sum of positive squares in 2 ways, for example, as 18974736 + 2521744 = 4356^2 + 1588^2 .

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67017 + ... + 67336.

Almost surely, 2^21496480 is an apocalyptic number.

21496480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21496480 is an abundant number, since it is smaller than the sum of its proper divisors (29289332).

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

21496480 is a wasteful number, since it uses less digits than its factorization.

21496480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134368 (or 134360 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 21496480 is about 4636.4296608490. The cubic root of 21496480 is about 278.0497124838.

The spelling of 21496480 in words is "twenty-one million, four hundred ninety-six thousand, four hundred eighty".