221166007 has 2 divisors, whose sum is σ = 221166008. Its totient is φ = 221166006.

The previous prime is 221165993. The next prime is 221166019. The reversal of 221166007 is 700661122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221166007 - 2¹⁹ = 220641719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221166047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110583003 + 110583004.

It is an arithmetic number, because the mean of its divisors is an integer number (110583004).

Almost surely, 2^221166007 is an apocalyptic number.

221166007 is a deficient number, since it is larger than the sum of its proper divisors (1).

221166007 is an equidigital number, since it uses as much as digits as its factorization.

221166007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 221166007 is about 14871.6511188234. The cubic root of 221166007 is about 604.7457046626.

The spelling of 221166007 in words is "two hundred twenty-one million, one hundred sixty-six thousand, seven".