2667221 has 2 divisors, whose sum is σ = 2667222. Its totient is φ = 2667220.

The previous prime is 2667211. The next prime is 2667227. The reversal of 2667221 is 1227662.

2667221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1876900 + 790321 = 1370^2 + 889^2 .

It is a cyclic number.

It is not a de Polignac number, because 2667221 - 2¹⁰ = 2666197 is a prime.

It is a super-2 number, since 2×2667221² = 14228135725682, 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 (2667227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333610 + 1333611.

It is an arithmetic number, because the mean of its divisors is an integer number (1333611).

2^2667221 is an apocalyptic number.

It is an amenable number.

2667221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2667221 is an equidigital number, since it uses as much as digits as its factorization.

2667221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

The square root of 2667221 is about 1633.1628822625. The cubic root of 2667221 is about 138.6818630361.

The spelling of 2667221 in words is "two million, six hundred sixty-seven thousand, two hundred twenty-one".