221212201111101 has 12 divisors (see below), whose sum is σ = 319751713836828. Its totient is φ = 147371887402944.

The previous prime is 221212201111091. The next prime is 221212201111103. The reversal of 221212201111101 is 101111102212122.

It is a happy number.

221212201111101 is a `hidden beast` number, since 221 + 2 + 1 + 220 + 111 + 110 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 107705976666201 + 113506224444900 = 10378149^2 + 10653930^2 .

It is not a de Polignac number, because 221212201111101 - 2⁷ = 221212201110973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212201111103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8576097870 + ... + 8576123663.

It is an arithmetic number, because the mean of its divisors is an integer number (26645976153069).

Almost surely, 2^{221212201111101} is an apocalyptic number.

It is an amenable number.

221212201111101 is a deficient number, since it is larger than the sum of its proper divisors (98539512725727).

221212201111101 is a wasteful number, since it uses less digits than its factorization.

221212201111101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17152222972 (or 17152222969 counting only the distinct ones).

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

Adding to 221212201111101 its reverse (101111102212122), we get a palindrome (322323303323223).

The spelling of 221212201111101 in words is "two hundred twenty-one trillion, two hundred twelve billion, two hundred one million, one hundred eleven thousand, one hundred one".