221211111001 has 8 divisors (see below), whose sum is σ = 226988440704. Its totient is φ = 215478394320.

The previous prime is 221211110971. The next prime is 221211111031. The reversal of 221211111001 is 100111112122.

It is a happy number.

221211111001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221211110971) and next prime (221211111031).

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 221211111001 - 2⁷ = 221211110873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221211111031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11143210 + ... + 11163043.

It is an arithmetic number, because the mean of its divisors is an integer number (28373555088).

Almost surely, 2^221211111001 is an apocalyptic number.

It is an amenable number.

221211111001 is a deficient number, since it is larger than the sum of its proper divisors (5777329703).

221211111001 is a wasteful number, since it uses less digits than its factorization.

221211111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22306511.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 221211111001 its reverse (100111112122), we get a palindrome (321322223123).

The spelling of 221211111001 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, one".