21484760 has 96 divisors (see below), whose sum is σ = 55732320. Its totient is φ = 7434240.

The previous prime is 21484759. The next prime is 21484807. The reversal of 21484760 is 6748412.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 111224 + ... + 111416.

It is an arithmetic number, because the mean of its divisors is an integer number (580545).

Almost surely, 2^21484760 is an apocalyptic number.

21484760 is a gapful number since it is divisible by the number (20) 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 21484760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27866160).

21484760 is an abundant number, since it is smaller than the sum of its proper divisors (34247560).

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

21484760 is a wasteful number, since it uses less digits than its factorization.

21484760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 21484760 is about 4635.1655849603. The cubic root of 21484760 is about 277.9991718830. Note that the first 3 decimals are identical.

The spelling of 21484760 in words is "twenty-one million, four hundred eighty-four thousand, seven hundred sixty".