21040323 has 8 divisors (see below), whose sum is σ = 28259088. Its totient is φ = 13924224.

The previous prime is 21040297. The next prime is 21040387. The reversal of 21040323 is 32304012.

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

It is not a de Polignac number, because 21040323 - 2¹² = 21036227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21048323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25186 + ... + 26007.

It is an arithmetic number, because the mean of its divisors is an integer number (3532386).

Almost surely, 2^21040323 is an apocalyptic number.

21040323 is a deficient number, since it is larger than the sum of its proper divisors (7218765).

21040323 is a wasteful number, since it uses less digits than its factorization.

21040323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51333.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21040323 is about 4586.9731850099. The cubic root of 21040323 is about 276.0688890212.

Adding to 21040323 its reverse (32304012), we get a palindrome (53344335).

The spelling of 21040323 in words is "twenty-one million, forty thousand, three hundred twenty-three".