221012211201111 has 64 divisors (see below), whose sum is σ = 359200653926400. Its totient is φ = 133193401336800.

The previous prime is 221012211201107. The next prime is 221012211201127. The reversal of 221012211201111 is 111102112210122.

It is a happy number.

221012211201111 is a `hidden beast` number, since 2 + 210 + 1 + 221 + 120 + 1 + 111 = 666.

It is not a de Polignac number, because 221012211201111 - 2² = 221012211201107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012211201191) 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 63 ways as a sum of consecutive naturals, for example, 1758090720 + ... + 1758216426.

It is an arithmetic number, because the mean of its divisors is an integer number (5612510217600).

Almost surely, 2^{221012211201111} is an apocalyptic number.

221012211201111 is a deficient number, since it is larger than the sum of its proper divisors (138188442725289).

221012211201111 is a wasteful number, since it uses less digits than its factorization.

221012211201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158977 (or 158971 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221012211201111 its reverse (111102112210122), we get a palindrome (332114323411233).

The spelling of 221012211201111 in words is "two hundred twenty-one trillion, twelve billion, two hundred eleven million, two hundred one thousand, one hundred eleven".