21068160 has 64 divisors (see below), whose sum is σ = 67160880. Its totient is φ = 5617664.

The previous prime is 21068149. The next prime is 21068167. The reversal of 21068160 is 6186012.

21068160 = 1526² + 1527² + ... + 1534².

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 21068160.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21068167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3567 + ... + 7406.

Almost surely, 2^21068160 is an apocalyptic number.

21068160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21068160 is an abundant number, since it is smaller than the sum of its proper divisors (46092720).

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

21068160 is a wasteful number, since it uses less digits than its factorization.

21068160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10995 (or 10983 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 21068160 is about 4590.0065359431. The cubic root of 21068160 is about 276.1905846026.

The spelling of 21068160 in words is "twenty-one million, sixty-eight thousand, one hundred sixty".