21845488 has 20 divisors (see below), whose sum is σ = 48372400. Its totient is φ = 9362304.

The previous prime is 21845471. The next prime is 21845489. The reversal of 21845488 is 88454812.

It is a self number, because there is not a number n which added to its sum of digits gives 21845488.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21845489) 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 3 ways as a sum of consecutive naturals, for example, 97413 + ... + 97636.

It is an arithmetic number, because the mean of its divisors is an integer number (2418620).

Almost surely, 2^21845488 is an apocalyptic number.

21845488 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21845488 is an abundant number, since it is smaller than the sum of its proper divisors (26526912).

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

21845488 is a wasteful number, since it uses less digits than its factorization.

21845488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195064 (or 195058 counting only the distinct ones).

The product of its digits is 81920, while the sum is 40.

The square root of 21845488 is about 4673.9157031337. The cubic root of 21845488 is about 279.5464084493.

The spelling of 21845488 in words is "twenty-one million, eight hundred forty-five thousand, four hundred eighty-eight".