21054048 has 24 divisors (see below), whose sum is σ = 55267128. Its totient is φ = 7017984.

The previous prime is 21054037. The next prime is 21054049. The reversal of 21054048 is 84045012.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109561 + ... + 109752.

It is an arithmetic number, because the mean of its divisors is an integer number (2302797).

Almost surely, 2^21054048 is an apocalyptic number.

It is an amenable number.

21054048 is an abundant number, since it is smaller than the sum of its proper divisors (34213080).

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

21054048 is a wasteful number, since it uses less digits than its factorization.

21054048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219326 (or 219318 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 21054048 is about 4588.4690257209. The cubic root of 21054048 is about 276.1289042898.

The spelling of 21054048 in words is "twenty-one million, fifty-four thousand, forty-eight".