211221222201 has 24 divisors (see below), whose sum is σ = 332848380384. Its totient is φ = 128007116160.

The previous prime is 211221222169. The next prime is 211221222211. The reversal of 211221222201 is 102222122112.

It is a happy number.

211221222201 is a `hidden beast` number, since 21 + 1 + 221 + 222 + 201 = 666.

It is not a de Polignac number, because 211221222201 - 2⁵ = 211221222169 is a prime.

It is a super-2 number, since 2×211221222201² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211221222211) 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 23 ways as a sum of consecutive naturals, for example, 3461185 + ... + 3521681.

It is an arithmetic number, because the mean of its divisors is an integer number (13868682516).

Almost surely, 2^211221222201 is an apocalyptic number.

It is an amenable number.

211221222201 is a deficient number, since it is larger than the sum of its proper divisors (121627158183).

211221222201 is a wasteful number, since it uses less digits than its factorization.

211221222201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95781 (or 95778 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 211221222201 its reverse (102222122112), we get a palindrome (313443344313).

The spelling of 211221222201 in words is "two hundred eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred one".