221211221211 has 40 divisors (see below), whose sum is σ = 333879042288. Its totient is φ = 145945800000.

The previous prime is 221211221201. The next prime is 221211221219. The reversal of 221211221211 is 112122112122.

221211221211 is a `hidden beast` number, since 2 + 21 + 211 + 221 + 211 = 666.

It is not a de Polignac number, because 221211221211 - 2²² = 221207026907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221211221219) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 22337361 + ... + 22347261.

Almost surely, 2^221211221211 is an apocalyptic number.

221211221211 is a deficient number, since it is larger than the sum of its proper divisors (112667821077).

221211221211 is a wasteful number, since it uses less digits than its factorization.

221211221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12745 (or 12736 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 221211221211 its reverse (112122112122), we get a palindrome (333333333333).

The spelling of 221211221211 in words is "two hundred twenty-one billion, two hundred eleven million, two hundred twenty-one thousand, two hundred eleven".