21034323 has 12 divisors (see below), whose sum is σ = 31508568. Its totient is φ = 14022720.

The previous prime is 21034313. The next prime is 21034331. The reversal of 21034323 is 32343012.

It is not a de Polignac number, because 21034323 - 2⁸ = 21034067 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 21034296 and 21034305.

It is not an unprimeable number, because it can be changed into a prime (21034313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43038 + ... + 43523.

It is an arithmetic number, because the mean of its divisors is an integer number (2625714).

Almost surely, 2^21034323 is an apocalyptic number.

21034323 is a deficient number, since it is larger than the sum of its proper divisors (10474245).

21034323 is an frugal number, since it uses more digits than its factorization.

21034323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86576 (or 86564 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 21034323 is about 4586.3191123165. The cubic root of 21034323 is about 276.0426446394.

Adding to 21034323 its reverse (32343012), we get a palindrome (53377335).

The spelling of 21034323 in words is "twenty-one million, thirty-four thousand, three hundred twenty-three".