68005221 has 4 divisors (see below), whose sum is σ = 90673632. Its totient is φ = 45336812.

The previous prime is 68005213. The next prime is 68005279. The reversal of 68005221 is 12250086.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68005221 - 2³ = 68005213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68005191 and 68005200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68015221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11334201 + ... + 11334206.

It is an arithmetic number, because the mean of its divisors is an integer number (22668408).

Almost surely, 2^68005221 is an apocalyptic number.

It is an amenable number.

68005221 is a deficient number, since it is larger than the sum of its proper divisors (22668411).

68005221 is a wasteful number, since it uses less digits than its factorization.

68005221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22668410.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 68005221 is about 8246.5278147836. The cubic root of 68005221 is about 408.1759561603.

It can be divided in two parts, 6800 and 5221, that added together give a palindrome (12021).

The spelling of 68005221 in words is "sixty-eight million, five thousand, two hundred twenty-one".