21093144 has 32 divisors (see below), whose sum is σ = 54435840. Its totient is φ = 6804000.

The previous prime is 21093119. The next prime is 21093151. The reversal of 21093144 is 44139012.

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

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13432 + ... + 14919.

It is an arithmetic number, because the mean of its divisors is an integer number (1701120).

Almost surely, 2^21093144 is an apocalyptic number.

21093144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21093144 is an abundant number, since it is smaller than the sum of its proper divisors (33342696).

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

21093144 is a wasteful number, since it uses less digits than its factorization.

21093144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28391 (or 28387 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21093144 is about 4592.7272943209. The cubic root of 21093144 is about 276.2997164194.

It can be divided in two parts, 2109 and 3144, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 21093144 in words is "twenty-one million, ninety-three thousand, one hundred forty-four".