221101001211 has 8 divisors (see below), whose sum is σ = 294818213440. Its totient is φ = 147392228232.

The previous prime is 221101001203. The next prime is 221101001237. The reversal of 221101001211 is 112100101122.

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

It is not a de Polignac number, because 221101001211 - 2³ = 221101001203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221101001201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2048425 + ... + 2153658.

It is an arithmetic number, because the mean of its divisors is an integer number (36852276680).

Almost surely, 2^221101001211 is an apocalyptic number.

221101001211 is a deficient number, since it is larger than the sum of its proper divisors (73717212229).

221101001211 is a wasteful number, since it uses less digits than its factorization.

221101001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4219625.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 221101001211 its reverse (112100101122), we get a palindrome (333201102333).

The spelling of 221101001211 in words is "two hundred twenty-one billion, one hundred one million, one thousand, two hundred eleven".