221200121211111 has 64 divisors (see below), whose sum is σ = 378252986342400. Its totient is φ = 125139928752000.

The previous prime is 221200121211073. The next prime is 221200121211119. The reversal of 221200121211111 is 111112121002122.

It is a happy number.

221200121211111 is a `hidden beast` number, since 2 + 21 + 200 + 121 + 211 + 111 = 666.

It is not a de Polignac number, because 221200121211111 - 2⁹ = 221200121210599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200121211119) 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, 280806745 + ... + 281593373.

It is an arithmetic number, because the mean of its divisors is an integer number (5910202911600).

Almost surely, 2^{221200121211111} is an apocalyptic number.

221200121211111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221200121211111 is a deficient number, since it is larger than the sum of its proper divisors (157052865131289).

221200121211111 is a wasteful number, since it uses less digits than its factorization.

221200121211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801477 (or 801471 counting only the distinct ones).

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

Adding to 221200121211111 its reverse (111112121002122), we get a palindrome (332312242213233).

The spelling of 221200121211111 in words is "two hundred twenty-one trillion, two hundred billion, one hundred twenty-one million, two hundred eleven thousand, one hundred eleven".