221271667 has 2 divisors, whose sum is σ = 221271668. Its totient is φ = 221271666.

The previous prime is 221271649. The next prime is 221271683. The reversal of 221271667 is 766172122.

221271667 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 is a cyclic number.

It is not a de Polignac number, because 221271667 - 2⁷ = 221271539 is a prime.

It is a super-2 number, since 2×221271667² = 97922301233917778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221271607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110635833 + 110635834.

It is an arithmetic number, because the mean of its divisors is an integer number (110635834).

Almost surely, 2^221271667 is an apocalyptic number.

221271667 is a deficient number, since it is larger than the sum of its proper divisors (1).

221271667 is an equidigital number, since it uses as much as digits as its factorization.

221271667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 221271667 is about 14875.2030910506. The cubic root of 221271667 is about 604.8419932066.

The spelling of 221271667 in words is "two hundred twenty-one million, two hundred seventy-one thousand, six hundred sixty-seven".