21017368 has 32 divisors (see below), whose sum is σ = 40772160. Its totient is φ = 10150560.

The previous prime is 21017351. The next prime is 21017371. The reversal of 21017368 is 86371012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36523 + ... + 37093.

It is an arithmetic number, because the mean of its divisors is an integer number (1274130).

Almost surely, 2^21017368 is an apocalyptic number.

It is an amenable number.

21017368 is a deficient number, since it is larger than the sum of its proper divisors (19754792).

21017368 is a wasteful number, since it uses less digits than its factorization.

21017368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 21017368 is about 4584.4703074619. The cubic root of 21017368 is about 275.9684554021.

It can be divided in two parts, 210 and 17368, that added together give a triangular number (17578 = T₁₈₇).

The spelling of 21017368 in words is "twenty-one million, seventeen thousand, three hundred sixty-eight".