68311221 has 16 divisors (see below), whose sum is σ = 100623360. Its totient is φ = 40875120.

The previous prime is 68311193. The next prime is 68311231. The reversal of 68311221 is 12211386.

It is not a de Polignac number, because 68311221 - 2⁵ = 68311189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 68311191 and 68311200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68311231) 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 15 ways as a sum of consecutive naturals, for example, 10495 + ... + 15708.

It is an arithmetic number, because the mean of its divisors is an integer number (6288960).

Almost surely, 2^68311221 is an apocalyptic number.

It is an amenable number.

68311221 is a deficient number, since it is larger than the sum of its proper divisors (32312139).

68311221 is a wasteful number, since it uses less digits than its factorization.

68311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26296.

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

The square root of 68311221 is about 8265.0602538639. The cubic root of 68311221 is about 408.7872571226.

The spelling of 68311221 in words is "sixty-eight million, three hundred eleven thousand, two hundred twenty-one".