68220121 has 2 divisors, whose sum is σ = 68220122. Its totient is φ = 68220120.

The previous prime is 68220101. The next prime is 68220149. The reversal of 68220121 is 12102286.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48149721 + 20070400 = 6939^2 + 4480^2 .

It is a cyclic number.

It is not a de Polignac number, because 68220121 - 2⁷ = 68219993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68220092 and 68220101.

It is not a weakly prime, because it can be changed into another prime (68220101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34110060 + 34110061.

It is an arithmetic number, because the mean of its divisors is an integer number (34110061).

Almost surely, 2^68220121 is an apocalyptic number.

It is an amenable number.

68220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

68220121 is an equidigital number, since it uses as much as digits as its factorization.

68220121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 68220121 is about 8259.5472636217. The cubic root of 68220121 is about 408.6054564095.

The spelling of 68220121 in words is "sixty-eight million, two hundred twenty thousand, one hundred twenty-one".