21052343 has 8 divisors (see below), whose sum is σ = 22753248. Its totient is φ = 19363104.

The previous prime is 21052333. The next prime is 21052349. The reversal of 21052343 is 34325012.

It is a happy number.

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 21052343 - 2⁶ = 21052279 is a prime.

It is a super-2 number, since 2×21052343² = 886402291579298, which contains 22 as substring.

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 (21052349) 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, 1046 + ... + 6572.

It is an arithmetic number, because the mean of its divisors is an integer number (2844156).

Almost surely, 2^21052343 is an apocalyptic number.

21052343 is a deficient number, since it is larger than the sum of its proper divisors (1700905).

21052343 is a wasteful number, since it uses less digits than its factorization.

21052343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5833.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21052343 is about 4588.2832301417. The cubic root of 21052343 is about 276.1214502602.

Adding to 21052343 its reverse (34325012), we get a palindrome (55377355).

The spelling of 21052343 in words is "twenty-one million, fifty-two thousand, three hundred forty-three".