21165412 has 12 divisors (see below), whose sum is σ = 37072000. Its totient is φ = 10573416.

The previous prime is 21165409. The next prime is 21165421. The reversal of 21165412 is 21456112.

21165412 is nontrivially palindromic in base 14.

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, 6673 + ... + 9319.

Almost surely, 2^21165412 is an apocalyptic number.

It is an amenable number.

21165412 is a deficient number, since it is larger than the sum of its proper divisors (15906588).

21165412 is a wasteful number, since it uses less digits than its factorization.

21165412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4650 (or 4648 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 21165412 is about 4600.5882232602. The cubic root of 21165412 is about 276.6149036238.

The spelling of 21165412 in words is "twenty-one million, one hundred sixty-five thousand, four hundred twelve".