21616168 has 32 divisors (see below), whose sum is σ = 46670400. Its totient is φ = 9194112.

The previous prime is 21616157. The next prime is 21616169. The reversal of 21616168 is 86161612.

It is not an unprimeable number, because it can be changed into a prime (21616169) 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 7 ways as a sum of consecutive naturals, for example, 6396 + ... + 9172.

It is an arithmetic number, because the mean of its divisors is an integer number (1458450).

Almost surely, 2^21616168 is an apocalyptic number.

21616168 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21616168 is an abundant number, since it is smaller than the sum of its proper divisors (25054232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21616168 is a wasteful number, since it uses less digits than its factorization.

21616168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2929 (or 2925 counting only the distinct ones).

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

The square root of 21616168 is about 4649.3190899313. The cubic root of 21616168 is about 278.5647989907.

It can be divided in two parts, 216 and 16168, that added together give a 14-th power (16384 = 2¹⁴).

The spelling of 21616168 in words is "twenty-one million, six hundred sixteen thousand, one hundred sixty-eight".