221361667 has 2 divisors, whose sum is σ = 221361668. Its totient is φ = 221361666.

The previous prime is 221361653. The next prime is 221361671. The reversal of 221361667 is 766163122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221361667 is a prime.

It is not a weakly prime, because it can be changed into another prime (221361697) 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, 110680833 + 110680834.

It is an arithmetic number, because the mean of its divisors is an integer number (110680834).

Almost surely, 2^221361667 is an apocalyptic number.

221361667 is a deficient number, since it is larger than the sum of its proper divisors (1).

221361667 is an equidigital number, since it uses as much as digits as its factorization.

221361667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 221361667 is about 14878.2279522798. The cubic root of 221361667 is about 604.9239865340.

The spelling of 221361667 in words is "two hundred twenty-one million, three hundred sixty-one thousand, six hundred sixty-seven".