21484280 has 32 divisors (see below), whose sum is σ = 48673440. Its totient is φ = 8534400.

The previous prime is 21484279. The next prime is 21484289. The reversal of 21484280 is 8248412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21484289) 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, 4262 + ... + 7818.

It is an arithmetic number, because the mean of its divisors is an integer number (1521045).

Almost surely, 2^21484280 is an apocalyptic number.

21484280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21484280 is an abundant number, since it is smaller than the sum of its proper divisors (27189160).

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

21484280 is a wasteful number, since it uses less digits than its factorization.

21484280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3719 (or 3715 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 21484280 is about 4635.1138065856. The cubic root of 21484280 is about 277.9971015691.

The spelling of 21484280 in words is "twenty-one million, four hundred eighty-four thousand, two hundred eighty".