221100111212201 has 6 divisors (see below), whose sum is σ = 239416096756590. Its totient is φ = 204092410349568.

The previous prime is 221100111212111. The next prime is 221100111212209. The reversal of 221100111212201 is 102212111001122.

221100111212201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 12199484186176 + 208900627026025 = 3492776^2 + 14453395^2 .

It is a de Polignac number, because none of the positive numbers 2^k-221100111212201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221100111212201.

It is not an unprimeable number, because it can be changed into a prime (221100111212209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 654142340696 + ... + 654142341033.

It is an arithmetic number, because the mean of its divisors is an integer number (39902682792765).

Almost surely, 2^{221100111212201} is an apocalyptic number.

It is an amenable number.

221100111212201 is a deficient number, since it is larger than the sum of its proper divisors (18315985544389).

221100111212201 is a wasteful number, since it uses less digits than its factorization.

221100111212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308284681755 (or 1308284681742 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221100111212201 its reverse (102212111001122), we get a palindrome (323312222213323).

The spelling of 221100111212201 in words is "two hundred twenty-one trillion, one hundred billion, one hundred eleven million, two hundred twelve thousand, two hundred one".