21011168 has 12 divisors (see below), whose sum is σ = 41365800. Its totient is φ = 10505568.

The previous prime is 21011143. The next prime is 21011173. The reversal of 21011168 is 86111012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328268 + ... + 328331.

It is an arithmetic number, because the mean of its divisors is an integer number (3447150).

Almost surely, 2^21011168 is an apocalyptic number.

It is an amenable number.

21011168 is a deficient number, since it is larger than the sum of its proper divisors (20354632).

21011168 is an equidigital number, since it uses as much as digits as its factorization.

21011168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656609 (or 656601 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 21011168 is about 4583.7940616917. The cubic root of 21011168 is about 275.9413163759.

The spelling of 21011168 in words is "twenty-one million, eleven thousand, one hundred sixty-eight".