21093552 has 90 divisors (see below), whose sum is σ = 61238268. Its totient is φ = 6777216.

The previous prime is 21093551. The next prime is 21093563. The reversal of 21093552 is 25539012.

21093552 is a `hidden beast` number, since 2 + 109 + 3 + 552 = 666.

It is not an unprimeable number, because it can be changed into a prime (21093551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 197083 + ... + 197189.

Almost surely, 2^21093552 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 21093552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30619134).

21093552 is an abundant number, since it is smaller than the sum of its proper divisors (40144716).

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

21093552 is a wasteful number, since it uses less digits than its factorization.

21093552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 21093552 is about 4592.7717121581. The cubic root of 21093552 is about 276.3014978759.

The spelling of 21093552 in words is "twenty-one million, ninety-three thousand, five hundred fifty-two".