21916712 has 16 divisors (see below), whose sum is σ = 41395860. Its totient is φ = 10877824.

The previous prime is 21916669. The next prime is 21916753. The reversal of 21916712 is 21761912.

It can be written as a sum of positive squares in 2 ways, for example, as 20557156 + 1359556 = 4534^2 + 1166^2 .

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 in 3 ways as a sum of consecutive naturals, for example, 8903 + ... + 11094.

Almost surely, 2^21916712 is an apocalyptic number.

It is an amenable number.

21916712 is a deficient number, since it is larger than the sum of its proper divisors (19479148).

21916712 is a wasteful number, since it uses less digits than its factorization.

21916712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20140 (or 20136 counting only the distinct ones).

The product of its digits is 1512, while the sum is 29.

The square root of 21916712 is about 4681.5288101218. The cubic root of 21916712 is about 279.8498855209.

The spelling of 21916712 in words is "twenty-one million, nine hundred sixteen thousand, seven hundred twelve".