21130012 has 6 divisors (see below), whose sum is σ = 36977528. Its totient is φ = 10565004.

The previous prime is 21130001. The next prime is 21130027. The reversal of 21130012 is 21003112.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2641248 + ... + 2641255.

Almost surely, 2^21130012 is an apocalyptic number.

It is an amenable number.

21130012 is a deficient number, since it is larger than the sum of its proper divisors (15847516).

21130012 is a wasteful number, since it uses less digits than its factorization.

21130012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5282507 (or 5282505 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 21130012 is about 4596.7392790977. The cubic root of 21130012 is about 276.4606010612.

Adding to 21130012 its reverse (21003112), we get a palindrome (42133124).

The spelling of 21130012 in words is "twenty-one million, one hundred thirty thousand, twelve".