21080168 has 16 divisors (see below), whose sum is σ = 39682980. Its totient is φ = 10498048.

The previous prime is 21080161. The next prime is 21080173. The reversal of 21080168 is 86108012.

It can be written as a sum of positive squares in 2 ways, for example, as 20811844 + 268324 = 4562^2 + 518^2 .

It is not an unprimeable number, because it can be changed into a prime (21080161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3071 + ... + 7182.

Almost surely, 2^21080168 is an apocalyptic number.

It is an amenable number.

21080168 is a deficient number, since it is larger than the sum of its proper divisors (18602812).

21080168 is a wasteful number, since it uses less digits than its factorization.

21080168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10516 (or 10512 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 21080168 is about 4591.3144087505. The cubic root of 21080168 is about 276.2430471282.

The spelling of 21080168 in words is "twenty-one million, eighty thousand, one hundred sixty-eight".