221320001 has 8 divisors (see below), whose sum is σ = 256139520. Its totient is φ = 187301088.

The previous prime is 221319983. The next prime is 221320049. The reversal of 221320001 is 100023122.

It is a happy number.

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 221320001 - 2¹⁴ = 221303617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221320061) 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 in 7 ways as a sum of consecutive naturals, for example, 199556 + ... + 200661.

It is an arithmetic number, because the mean of its divisors is an integer number (32017440).

Almost surely, 2^221320001 is an apocalyptic number.

It is an amenable number.

221320001 is a deficient number, since it is larger than the sum of its proper divisors (34819519).

221320001 is an equidigital number, since it uses as much as digits as its factorization.

221320001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400303.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 221320001 is about 14876.8276524264. The cubic root of 221320001 is about 604.8860300309.

Adding to 221320001 its reverse (100023122), we get a palindrome (321343123).

The spelling of 221320001 in words is "two hundred twenty-one million, three hundred twenty thousand, one".