21234323 has 8 divisors (see below), whose sum is σ = 23215296. Its totient is φ = 19261800.

The previous prime is 21234307. The next prime is 21234347. The reversal of 21234323 is 32343212.

21234323 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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

It is a cyclic number.

It is not a de Polignac number, because 21234323 - 2⁴ = 21234307 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21234295 and 21234304.

It is not an unprimeable number, because it can be changed into a prime (21234373) 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, 3908 + ... + 7598.

It is an arithmetic number, because the mean of its divisors is an integer number (2901912).

Almost surely, 2^21234323 is an apocalyptic number.

21234323 is a deficient number, since it is larger than the sum of its proper divisors (1980973).

21234323 is a wasteful number, since it uses less digits than its factorization.

21234323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4225.

The product of its digits is 864, while the sum is 20.

The square root of 21234323 is about 4608.0715055216. The cubic root of 21234323 is about 276.9147821807.

Adding to 21234323 its reverse (32343212), we get a palindrome (53577535).

Subtracting 21234323 from its reverse (32343212), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 2123 and 4323, that added together give a palindrome (6446).

The spelling of 21234323 in words is "twenty-one million, two hundred thirty-four thousand, three hundred twenty-three".