67115221 has 2 divisors, whose sum is σ = 67115222. Its totient is φ = 67115220.

The previous prime is 67115203. The next prime is 67115227. The reversal of 67115221 is 12251176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46991025 + 20124196 = 6855^2 + 4486^2 .

It is a cyclic number.

It is not a de Polignac number, because 67115221 - 2⁹ = 67114709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67115227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33557610 + 33557611.

It is an arithmetic number, because the mean of its divisors is an integer number (33557611).

Almost surely, 2^67115221 is an apocalyptic number.

It is an amenable number.

67115221 is a deficient number, since it is larger than the sum of its proper divisors (1).

67115221 is an equidigital number, since it uses as much as digits as its factorization.

67115221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 25.

The square root of 67115221 is about 8192.3879913002. The cubic root of 67115221 is about 406.3875004067.

Adding to 67115221 its reverse (12251176), we get a palindrome (79366397).

The spelling of 67115221 in words is "sixty-seven million, one hundred fifteen thousand, two hundred twenty-one".