21376480 has 96 divisors (see below), whose sum is σ = 55520640. Its totient is φ = 7741440.

The previous prime is 21376471. The next prime is 21376483. The reversal of 21376480 is 8467312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21376483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78745 + ... + 79015.

It is an arithmetic number, because the mean of its divisors is an integer number (578340).

Almost surely, 2^21376480 is an apocalyptic number.

21376480 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 21376480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27760320).

21376480 is an abundant number, since it is smaller than the sum of its proper divisors (34144160).

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

21376480 is a wasteful number, since it uses less digits than its factorization.

21376480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21376480 is about 4623.4705579251. The cubic root of 21376480 is about 277.5313602521.

The spelling of 21376480 in words is "twenty-one million, three hundred seventy-six thousand, four hundred eighty".