21366712 has 16 divisors (see below), whose sum is σ = 40188600. Its totient is φ = 10649760.

The previous prime is 21366689. The next prime is 21366713. The reversal of 21366712 is 21766312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21366713) 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 3 ways as a sum of consecutive naturals, for example, 1387 + ... + 6682.

Almost surely, 2^21366712 is an apocalyptic number.

It is an amenable number.

21366712 is a deficient number, since it is larger than the sum of its proper divisors (18821888).

21366712 is a wasteful number, since it uses less digits than its factorization.

21366712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8406 (or 8402 counting only the distinct ones).

The product of its digits is 3024, while the sum is 28.

The square root of 21366712 is about 4622.4140878982. The cubic root of 21366712 is about 277.4890810843.

The spelling of 21366712 in words is "twenty-one million, three hundred sixty-six thousand, seven hundred twelve".