67698221 has 2 divisors, whose sum is σ = 67698222. Its totient is φ = 67698220.

The previous prime is 67698217. The next prime is 67698247. The reversal of 67698221 is 12289676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35832196 + 31866025 = 5986^2 + 5645^2 .

It is a cyclic number.

It is not a de Polignac number, because 67698221 - 2² = 67698217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67698721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33849110 + 33849111.

It is an arithmetic number, because the mean of its divisors is an integer number (33849111).

Almost surely, 2^67698221 is an apocalyptic number.

It is an amenable number.

67698221 is a deficient number, since it is larger than the sum of its proper divisors (1).

67698221 is an equidigital number, since it uses as much as digits as its factorization.

67698221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 67698221 is about 8227.8928651265. The cubic root of 67698221 is about 407.5608119314.

The spelling of 67698221 in words is "sixty-seven million, six hundred ninety-eight thousand, two hundred twenty-one".