68360221 has 4 divisors (see below), whose sum is σ = 70717500. Its totient is φ = 66002944.

The previous prime is 68360207. The next prime is 68360249. The reversal of 68360221 is 12206386.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12206386 = 2 ⋅6103193.

It can be written as a sum of positive squares in 2 ways, for example, as 57927321 + 10432900 = 7611^2 + 3230^2 .

It is a cyclic number.

It is not a de Polignac number, because 68360221 - 2⁵ = 68360189 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 68360221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68363221) 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, 1178596 + ... + 1178653.

It is an arithmetic number, because the mean of its divisors is an integer number (17679375).

Almost surely, 2^68360221 is an apocalyptic number.

It is an amenable number.

68360221 is a deficient number, since it is larger than the sum of its proper divisors (2357279).

68360221 is a wasteful number, since it uses less digits than its factorization.

68360221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357278.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 68360221 is about 8268.0240081896. The cubic root of 68360221 is about 408.8849755153.

The spelling of 68360221 in words is "sixty-eight million, three hundred sixty thousand, two hundred twenty-one".