338166221 has 2 divisors, whose sum is σ = 338166222. Its totient is φ = 338166220.

The previous prime is 338166211. The next prime is 338166247. The reversal of 338166221 is 122661833.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 292752100 + 45414121 = 17110^2 + 6739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-338166221 is a prime.

It is a super-2 number, since 2×338166221² = 228712786050841682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (338166211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169083110 + 169083111.

It is an arithmetic number, because the mean of its divisors is an integer number (169083111).

Almost surely, 2^338166221 is an apocalyptic number.

It is an amenable number.

338166221 is a deficient number, since it is larger than the sum of its proper divisors (1).

338166221 is an equidigital number, since it uses as much as digits as its factorization.

338166221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 338166221 is about 18389.2963704433. The cubic root of 338166221 is about 696.6961459969.

The spelling of 338166221 in words is "three hundred thirty-eight million, one hundred sixty-six thousand, two hundred twenty-one".