21548000 has 48 divisors (see below), whose sum is σ = 52953264. Its totient is φ = 8617600.

The previous prime is 21547997. The next prime is 21548011. The reversal of 21548000 is 84512.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1307 + ... + 6693.

It is an arithmetic number, because the mean of its divisors is an integer number (1103193).

Almost surely, 2^21548000 is an apocalyptic number.

21548000 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 21548000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26476632).

21548000 is an abundant number, since it is smaller than the sum of its proper divisors (31405264).

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

21548000 is an equidigital number, since it uses as much as digits as its factorization.

21548000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5412 (or 5394 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 21548000 is about 4641.9823351667. The cubic root of 21548000 is about 278.2716665308.

The spelling of 21548000 in words is "twenty-one million, five hundred forty-eight thousand".