68337221 has 2 divisors, whose sum is σ = 68337222. Its totient is φ = 68337220.

The previous prime is 68337173. The next prime is 68337239. The reversal of 68337221 is 12273386.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62236321 + 6100900 = 7889^2 + 2470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68337221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68337121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34168610 + 34168611.

It is an arithmetic number, because the mean of its divisors is an integer number (34168611).

Almost surely, 2^68337221 is an apocalyptic number.

It is an amenable number.

68337221 is a deficient number, since it is larger than the sum of its proper divisors (1).

68337221 is an equidigital number, since it uses as much as digits as its factorization.

68337221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 68337221 is about 8266.6329905228. The cubic root of 68337221 is about 408.8391135154.

The spelling of 68337221 in words is "sixty-eight million, three hundred thirty-seven thousand, two hundred twenty-one".