21744093 has 12 divisors (see below), whose sum is σ = 33725760. Its totient is φ = 12425112.

The previous prime is 21744089. The next prime is 21744097. The reversal of 21744093 is 39044712.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21744089) and next prime (21744097).

It is not a de Polignac number, because 21744093 - 2² = 21744089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21744093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21744097) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73813 + ... + 74106.

It is an arithmetic number, because the mean of its divisors is an integer number (2810480).

Almost surely, 2^21744093 is an apocalyptic number.

It is an amenable number.

21744093 is a deficient number, since it is larger than the sum of its proper divisors (11981667).

21744093 is a wasteful number, since it uses less digits than its factorization.

21744093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147936 (or 147929 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21744093 is about 4663.0561866656. The cubic root of 21744093 is about 279.1132362387.

The spelling of 21744093 in words is "twenty-one million, seven hundred forty-four thousand, ninety-three".