21482920 has 64 divisors (see below), whose sum is σ = 53136000. Its totient is φ = 7780608.

The previous prime is 21482899. The next prime is 21482927. The reversal of 21482920 is 2928412.

It is not an unprimeable number, because it can be changed into a prime (21482927) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 16866 + ... + 18094.

It is an arithmetic number, because the mean of its divisors is an integer number (830250).

Almost surely, 2^21482920 is an apocalyptic number.

21482920 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 21482920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26568000).

21482920 is an abundant number, since it is smaller than the sum of its proper divisors (31653080).

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

21482920 is a wasteful number, since it uses less digits than its factorization.

21482920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282 (or 1278 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21482920 is about 4634.9670980493. The cubic root of 21482920 is about 277.9912355120.

The spelling of 21482920 in words is "twenty-one million, four hundred eighty-two thousand, nine hundred twenty".