21130424 has 16 divisors (see below), whose sum is σ = 45279600. Its totient is φ = 9055872.

The previous prime is 21130423. The next prime is 21130453. The reversal of 21130424 is 42403112.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188609 + ... + 188720.

It is an arithmetic number, because the mean of its divisors is an integer number (2829975).

Almost surely, 2^21130424 is an apocalyptic number.

It is an amenable number.

21130424 is an abundant number, since it is smaller than the sum of its proper divisors (24149176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21130424 is a wasteful number, since it uses less digits than its factorization.

21130424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377342 (or 377338 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21130424 is about 4596.7840932548. The cubic root of 21130424 is about 276.4623978898.

Adding to 21130424 its reverse (42403112), we get a palindrome (63533536).

The spelling of 21130424 in words is "twenty-one million, one hundred thirty thousand, four hundred twenty-four".