21048 has 16 divisors (see below), whose sum is σ = 52680. Its totient is φ = 7008.

The previous prime is 21031. The next prime is 21059. The reversal of 21048 is 84012.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

21048 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415 + ... + 462.

2²¹⁰⁴⁸ is an apocalyptic number.

It is an amenable number.

21048 is an abundant number, since it is smaller than the sum of its proper divisors (31632).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26340).

21048 is a wasteful number, since it uses less digits than its factorization.

21048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 882 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21048 is about 145.0792886666. The cubic root of 21048 is about 27.6102461433.

Adding to 21048 its product of nonzero digits (64), we get a palindrome (21112).

It can be divided in two parts, 2104 and 8, that added together give a palindrome (2112).

The spelling of 21048 in words is "twenty-one thousand, forty-eight".