21488480 has 48 divisors (see below), whose sum is σ = 54676944. Its totient is φ = 7933440.

The previous prime is 21488477. The next prime is 21488483. The reversal of 21488480 is 8488412.

It is an interprime number because it is at equal distance from previous prime (21488477) and next prime (21488483).

It is a self number, because there is not a number n which added to its sum of digits gives 21488480.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21488483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3086 + ... + 7245.

It is an arithmetic number, because the mean of its divisors is an integer number (1139103).

Almost surely, 2^21488480 is an apocalyptic number.

21488480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21488480 is an abundant number, since it is smaller than the sum of its proper divisors (33188464).

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

21488480 is a wasteful number, since it uses less digits than its factorization.

21488480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10359 (or 10351 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 21488480 is about 4635.5668477544. The cubic root of 21488480 is about 278.0152157709.

The spelling of 21488480 in words is "twenty-one million, four hundred eighty-eight thousand, four hundred eighty".