221011221111211 has 16 divisors (see below), whose sum is σ = 232683299936640. Its totient is φ = 209343136184640.

The previous prime is 221011221111199. The next prime is 221011221111221. The reversal of 221011221111211 is 112111122110122.

It is a cyclic number.

It is not a de Polignac number, because 221011221111211 - 2⁹ = 221011221110699 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221011221111221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5725215036 + ... + 5725253638.

It is an arithmetic number, because the mean of its divisors is an integer number (14542706246040).

Almost surely, 2^{221011221111211} is an apocalyptic number.

221011221111211 is a deficient number, since it is larger than the sum of its proper divisors (11672078825429).

221011221111211 is a wasteful number, since it uses less digits than its factorization.

221011221111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82506.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 221011221111211 its reverse (112111122110122), we get a palindrome (333122343221333).

The spelling of 221011221111211 in words is "two hundred twenty-one trillion, eleven billion, two hundred twenty-one million, one hundred eleven thousand, two hundred eleven".