21846723 has 16 divisors (see below), whose sum is σ = 30569472. Its totient is φ = 13860000.

The previous prime is 21846701. The next prime is 21846731. The reversal of 21846723 is 32764812.

It is not a de Polignac number, because 21846723 - 2⁸ = 21846467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21846733) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3748 + ... + 7598.

It is an arithmetic number, because the mean of its divisors is an integer number (1910592).

Almost surely, 2^21846723 is an apocalyptic number.

21846723 is a deficient number, since it is larger than the sum of its proper divisors (8722749).

21846723 is a wasteful number, since it uses less digits than its factorization.

21846723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3946.

The product of its digits is 16128, while the sum is 33.

The square root of 21846723 is about 4674.0478174704. The cubic root of 21846723 is about 279.5516762542.

The spelling of 21846723 in words is "twenty-one million, eight hundred forty-six thousand, seven hundred twenty-three".