68121217 has 4 divisors (see below), whose sum is σ = 68137920. Its totient is φ = 68104516.

The previous prime is 68121187. The next prime is 68121233. The reversal of 68121217 is 71212186.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 68121217 - 2⁷ = 68121089 is a prime.

It is a super-2 number, since 2×68121217² = 9281000411122178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68121247) 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, 2268 + ... + 11890.

It is an arithmetic number, because the mean of its divisors is an integer number (17034480).

Almost surely, 2^68121217 is an apocalyptic number.

It is an amenable number.

68121217 is a deficient number, since it is larger than the sum of its proper divisors (16703).

68121217 is an equidigital number, since it uses as much as digits as its factorization.

68121217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16702.

The product of its digits is 1344, while the sum is 28.

The square root of 68121217 is about 8253.5578388959. The cubic root of 68121217 is about 408.4078985676.

The spelling of 68121217 in words is "sixty-eight million, one hundred twenty-one thousand, two hundred seventeen".