221166001 has 8 divisors (see below), whose sum is σ = 253208384. Its totient is φ = 189235440.

The previous prime is 221165993. The next prime is 221166007. The reversal of 221166001 is 100661122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221166001 - 2³ = 221165993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221166001.

It is not an unprimeable number, because it can be changed into a prime (221166007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23670 + ... + 31663.

It is an arithmetic number, because the mean of its divisors is an integer number (31651048).

Almost surely, 2^221166001 is an apocalyptic number.

It is an amenable number.

221166001 is a deficient number, since it is larger than the sum of its proper divisors (32042383).

221166001 is an equidigital number, since it uses as much as digits as its factorization.

221166001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55911.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 221166001 is about 14871.6509170973. The cubic root of 221166001 is about 604.7456991939.

The spelling of 221166001 in words is "two hundred twenty-one million, one hundred sixty-six thousand, one".