21130712 has 16 divisors (see below), whose sum is σ = 39830400. Its totient is φ = 10509280.

The previous prime is 21130699. The next prime is 21130727. The reversal of 21130712 is 21703112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5387 + ... + 8442.

It is an arithmetic number, because the mean of its divisors is an integer number (2489400).

Almost surely, 2^21130712 is an apocalyptic number.

It is an amenable number.

21130712 is a deficient number, since it is larger than the sum of its proper divisors (18699688).

21130712 is a wasteful number, since it uses less digits than its factorization.

21130712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14026 (or 14022 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 21130712 is about 4596.8154193963. The cubic root of 21130712 is about 276.4636539114.

Adding to 21130712 its reverse (21703112), we get a palindrome (42833824).

The spelling of 21130712 in words is "twenty-one million, one hundred thirty thousand, seven hundred twelve".