21744092 has 12 divisors (see below), whose sum is σ = 38330880. Its totient is φ = 10792416.

The previous prime is 21744089. The next prime is 21744097. The reversal of 21744092 is 29044712.

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 3 ways as a sum of consecutive naturals, for example, 19292 + ... + 20387.

It is an arithmetic number, because the mean of its divisors is an integer number (3194240).

Almost surely, 2^21744092 is an apocalyptic number.

It is an amenable number.

21744092 is a deficient number, since it is larger than the sum of its proper divisors (16586788).

21744092 is a wasteful number, since it uses less digits than its factorization.

21744092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39820 (or 39818 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21744092 is about 4663.0560794397. The cubic root of 21744092 is about 279.1132319599.

The spelling of 21744092 in words is "twenty-one million, seven hundred forty-four thousand, ninety-two".