21130006 has 16 divisors (see below), whose sum is σ = 32739840. Its totient is φ = 10221120.

The previous prime is 21130001. The next prime is 21130027. The reversal of 21130006 is 60003112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130001) 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 7 ways as a sum of consecutive naturals, for example, 9400 + ... + 11428.

It is an arithmetic number, because the mean of its divisors is an integer number (2046240).

Almost surely, 2^21130006 is an apocalyptic number.

21130006 is a deficient number, since it is larger than the sum of its proper divisors (11609834).

21130006 is a wasteful number, since it uses less digits than its factorization.

21130006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21130006 is about 4596.7386264612. The cubic root of 21130006 is about 276.4605748936.

Adding to 21130006 its reverse (60003112), we get a palindrome (81133118).

The spelling of 21130006 in words is "twenty-one million, one hundred thirty thousand, six".