68006221 has 4 divisors (see below), whose sum is σ = 68094972. Its totient is φ = 67917472.

The previous prime is 68006203. The next prime is 68006231. The reversal of 68006221 is 12260086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12260086 = 2 ⋅6130043.

It can be written as a sum of positive squares in 2 ways, for example, as 38303721 + 29702500 = 6189^2 + 5450^2 .

It is a cyclic number.

It is not a de Polignac number, because 68006221 - 2⁷ = 68006093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68006231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43216 + ... + 44761.

It is an arithmetic number, because the mean of its divisors is an integer number (17023743).

Almost surely, 2^68006221 is an apocalyptic number.

It is an amenable number.

68006221 is a deficient number, since it is larger than the sum of its proper divisors (88751).

68006221 is an equidigital number, since it uses as much as digits as its factorization.

68006221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88750.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 68006221 is about 8246.5884461394. The cubic root of 68006221 is about 408.1779568594.

The spelling of 68006221 in words is "sixty-eight million, six thousand, two hundred twenty-one".