21094128 has 160 divisors (see below), whose sum is σ = 69281280. Its totient is φ = 6082560.

The previous prime is 21094111. The next prime is 21094133. The reversal of 21094128 is 82149012.

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

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 109200 + ... + 109392.

It is an arithmetic number, because the mean of its divisors is an integer number (433008).

Almost surely, 2^21094128 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 21094128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34640640).

21094128 is an abundant number, since it is smaller than the sum of its proper divisors (48187152).

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

21094128 is a wasteful number, since it uses less digits than its factorization.

21094128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 21094128 is about 4592.8344189618. The cubic root of 21094128 is about 276.3040128343.

The spelling of 21094128 in words is "twenty-one million, ninety-four thousand, one hundred twenty-eight".