21130339 has 4 divisors (see below), whose sum is σ = 21476800. Its totient is φ = 20783880.

The previous prime is 21130331. The next prime is 21130397. The reversal of 21130339 is 93303112.

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 21130339 - 2³ = 21130331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21130331) 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, 173139 + ... + 173260.

It is an arithmetic number, because the mean of its divisors is an integer number (5369200).

Almost surely, 2^21130339 is an apocalyptic number.

21130339 is a deficient number, since it is larger than the sum of its proper divisors (346461).

21130339 is an equidigital number, since it uses as much as digits as its factorization.

21130339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346460.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 21130339 is about 4596.7748476513. The cubic root of 21130339 is about 276.4620271868.

The spelling of 21130339 in words is "twenty-one million, one hundred thirty thousand, three hundred thirty-nine".