21168470 has 32 divisors (see below), whose sum is σ = 41057280. Its totient is φ = 7832160.

The previous prime is 21168461. The next prime is 21168479. The reversal of 21168470 is 7486112.

It is an interprime number because it is at equal distance from previous prime (21168461) and next prime (21168479).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21168479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6875 + ... + 9465.

It is an arithmetic number, because the mean of its divisors is an integer number (1283040).

Almost surely, 2^21168470 is an apocalyptic number.

21168470 is a deficient number, since it is larger than the sum of its proper divisors (19888810).

21168470 is a wasteful number, since it uses less digits than its factorization.

21168470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2660.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 21168470 is about 4600.9205600619. The cubic root of 21168470 is about 276.6282248487.

The spelling of 21168470 in words is "twenty-one million, one hundred sixty-eight thousand, four hundred seventy".