68299221 has 4 divisors (see below), whose sum is σ = 91065632. Its totient is φ = 45532812.

The previous prime is 68299207. The next prime is 68299237. The reversal of 68299221 is 12299286.

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 not a de Polignac number, because 68299221 - 2⁶ = 68299157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 68299221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68299271) 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, 11383201 + ... + 11383206.

It is an arithmetic number, because the mean of its divisors is an integer number (22766408).

Almost surely, 2^68299221 is an apocalyptic number.

It is an amenable number.

68299221 is a deficient number, since it is larger than the sum of its proper divisors (22766411).

68299221 is a wasteful number, since it uses less digits than its factorization.

68299221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22766410.

The product of its digits is 31104, while the sum is 39.

The square root of 68299221 is about 8264.3342744591. The cubic root of 68299221 is about 408.7633189649.

The spelling of 68299221 in words is "sixty-eight million, two hundred ninety-nine thousand, two hundred twenty-one".