21034343 has 4 divisors (see below), whose sum is σ = 22946568. Its totient is φ = 19122120.

The previous prime is 21034331. The next prime is 21034357. The reversal of 21034343 is 34343012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21034343 - 2¹⁰ = 21033319 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034313) 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 3 ways as a sum of consecutive naturals, for example, 956096 + ... + 956117.

It is an arithmetic number, because the mean of its divisors is an integer number (5736642).

Almost surely, 2^21034343 is an apocalyptic number.

21034343 is a deficient number, since it is larger than the sum of its proper divisors (1912225).

21034343 is a wasteful number, since it uses less digits than its factorization.

21034343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1912224.

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

The square root of 21034343 is about 4586.3212927138. The cubic root of 21034343 is about 276.0427321290.

Adding to 21034343 its reverse (34343012), we get a palindrome (55377355).

It can be divided in two parts, 2103 and 4343, that added together give a palindrome (6446).

The spelling of 21034343 in words is "twenty-one million, thirty-four thousand, three hundred forty-three".