221211001 has 8 divisors (see below), whose sum is σ = 245412000. Its totient is φ = 197691840.

The previous prime is 221210993. The next prime is 221211017. The reversal of 221211001 is 100112122.

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 221211001 - 2³ = 221210993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221217001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169776 + ... + 171073.

It is an arithmetic number, because the mean of its divisors is an integer number (30676500).

Almost surely, 2^221211001 is an apocalyptic number.

It is an amenable number.

221211001 is a deficient number, since it is larger than the sum of its proper divisors (24200999).

221211001 is a wasteful number, since it uses less digits than its factorization.

221211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340919.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 221211001 is about 14873.1637858258. The cubic root of 221211001 is about 604.7867116926.

Adding to 221211001 its reverse (100112122), we get a palindrome (321323123).

The spelling of 221211001 in words is "two hundred twenty-one million, two hundred eleven thousand, one".