21068755 has 8 divisors (see below), whose sum is σ = 25307712. Its totient is φ = 16838208.

The previous prime is 21068741. The next prime is 21068807. The reversal of 21068755 is 55786012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21068755 - 2¹¹ = 21066707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21068755.

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, 7014 + ... + 9556.

It is an arithmetic number, because the mean of its divisors is an integer number (3163464).

Almost surely, 2^21068755 is an apocalyptic number.

21068755 is a deficient number, since it is larger than the sum of its proper divisors (4238957).

21068755 is a wasteful number, since it uses less digits than its factorization.

21068755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4205.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 21068755 is about 4590.0713502080. The cubic root of 21068755 is about 276.1931846058.

The spelling of 21068755 in words is "twenty-one million, sixty-eight thousand, seven hundred fifty-five".