221202212101 has 6 divisors (see below), whose sum is σ = 239526655890. Its totient is φ = 204186657168.

The previous prime is 221202212083. The next prime is 221202212141. The reversal of 221202212101 is 101212202122.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 19951280001 + 201250932100 = 141249^2 + 448610^2 .

It is not a de Polignac number, because 221202212101 - 2⁹ = 221202211589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221202212141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 654444246 + ... + 654444583.

It is an arithmetic number, because the mean of its divisors is an integer number (39921109315).

Almost surely, 2^221202212101 is an apocalyptic number.

It is an amenable number.

221202212101 is a deficient number, since it is larger than the sum of its proper divisors (18324443789).

221202212101 is a wasteful number, since it uses less digits than its factorization.

221202212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308888855 (or 1308888842 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221202212101 its reverse (101212202122), we get a palindrome (322414414223).

The spelling of 221202212101 in words is "two hundred twenty-one billion, two hundred two million, two hundred twelve thousand, one hundred one".