21573323 has 8 divisors (see below), whose sum is σ = 22884192. Its totient is φ = 20267136.

The previous prime is 21573317. The next prime is 21573353. The reversal of 21573323 is 32337512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21573323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21573292 and 21573301.

It is not an unprimeable number, because it can be changed into a prime (21573353) 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 7 ways as a sum of consecutive naturals, for example, 14186 + ... + 15632.

It is an arithmetic number, because the mean of its divisors is an integer number (2860524).

Almost surely, 2^21573323 is an apocalyptic number.

21573323 is a deficient number, since it is larger than the sum of its proper divisors (1310869).

21573323 is a wasteful number, since it uses less digits than its factorization.

21573323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341.

The product of its digits is 3780, while the sum is 26.

The square root of 21573323 is about 4644.7091405168. The cubic root of 21573323 is about 278.3806312424.

The spelling of 21573323 in words is "twenty-one million, five hundred seventy-three thousand, three hundred twenty-three".