21093048 has 80 divisors (see below), whose sum is σ = 60533880. Its totient is φ = 6858432.

The previous prime is 21093041. The next prime is 21093053. The reversal of 21093048 is 84039012.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21093041) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 27486 + ... + 28242.

Almost surely, 2^21093048 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21093048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30266940).

21093048 is an abundant number, since it is smaller than the sum of its proper divisors (39440832).

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

21093048 is a wasteful number, since it uses less digits than its factorization.

21093048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818 (or 805 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 21093048 is about 4592.7168430026. The cubic root of 21093048 is about 276.2992972498.

The spelling of 21093048 in words is "twenty-one million, ninety-three thousand, forty-eight".