21130443 has 16 divisors (see below), whose sum is σ = 31388160. Its totient is φ = 14049288.

The previous prime is 21130423. The next prime is 21130453. The reversal of 21130443 is 34403112.

It is not a de Polignac number, because 21130443 - 2¹³ = 21122251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21130423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12346 + ... + 13952.

It is an arithmetic number, because the mean of its divisors is an integer number (1961760).

Almost surely, 2^21130443 is an apocalyptic number.

21130443 is a deficient number, since it is larger than the sum of its proper divisors (10257717).

21130443 is a wasteful number, since it uses less digits than its factorization.

21130443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2103 (or 2097 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21130443 is about 4596.7861599165. The cubic root of 21130443 is about 276.4624807527.

Adding to 21130443 its reverse (34403112), we get a palindrome (55533555).

The spelling of 21130443 in words is "twenty-one million, one hundred thirty thousand, four hundred forty-three".