21026168 has 16 divisors (see below), whose sum is σ = 39474000. Its totient is φ = 10499776.

The previous prime is 21026149. The next prime is 21026171. The reversal of 21026168 is 86162012.

It is a congruent number.

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, 9293 + ... + 11331.

It is an arithmetic number, because the mean of its divisors is an integer number (2467125).

Almost surely, 2^21026168 is an apocalyptic number.

It is an amenable number.

21026168 is a deficient number, since it is larger than the sum of its proper divisors (18447832).

21026168 is a wasteful number, since it uses less digits than its factorization.

21026168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3334 (or 3330 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 21026168 is about 4585.4299689342. The cubic root of 21026168 is about 276.0069661478.

The spelling of 21026168 in words is "twenty-one million, twenty-six thousand, one hundred sixty-eight".