21130335 has 16 divisors (see below), whose sum is σ = 37565280. Its totient is φ = 11269440.

The previous prime is 21130331. The next prime is 21130397. The reversal of 21130335 is 53303112.

It is not a de Polignac number, because 21130335 - 2² = 21130331 is a prime.

It is a congruent 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 (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78126 + ... + 78395.

It is an arithmetic number, because the mean of its divisors is an integer number (2347830).

Almost surely, 2^21130335 is an apocalyptic number.

21130335 is a deficient number, since it is larger than the sum of its proper divisors (16434945).

21130335 is a wasteful number, since it uses less digits than its factorization.

21130335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156535 (or 156529 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 18.

The square root of 21130335 is about 4596.7744125637. The cubic root of 21130335 is about 276.4620097419.

Adding to 21130335 its reverse (53303112), we get a palindrome (74433447).

The spelling of 21130335 in words is "twenty-one million, one hundred thirty thousand, three hundred thirty-five".