21229168 has 10 divisors (see below), whose sum is σ = 41131544. Its totient is φ = 10614576.

The previous prime is 21229163. The next prime is 21229177. The reversal of 21229168 is 86192212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21229163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663396 + ... + 663427.

Almost surely, 2^21229168 is an apocalyptic number.

It is an amenable number.

21229168 is a deficient number, since it is larger than the sum of its proper divisors (19902376).

21229168 is a wasteful number, since it uses less digits than its factorization.

21229168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326831 (or 1326825 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 21229168 is about 4607.5121269509. The cubic root of 21229168 is about 276.8923717459.

The spelling of 21229168 in words is "twenty-one million, two hundred twenty-nine thousand, one hundred sixty-eight".