68045221 has 4 divisors (see below), whose sum is σ = 69627712. Its totient is φ = 66462732.

The previous prime is 68045207. The next prime is 68045233. The reversal of 68045221 is 12254086.

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 68045221 - 2¹⁹ = 67520933 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 68045221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68045291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 791181 + ... + 791266.

It is an arithmetic number, because the mean of its divisors is an integer number (17406928).

Almost surely, 2^68045221 is an apocalyptic number.

It is an amenable number.

68045221 is a deficient number, since it is larger than the sum of its proper divisors (1582491).

68045221 is a wasteful number, since it uses less digits than its factorization.

68045221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582490.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 68045221 is about 8248.9527214065. The cubic root of 68045221 is about 408.2559688315.

The spelling of 68045221 in words is "sixty-eight million, forty-five thousand, two hundred twenty-one".