201221102101 has 4 divisors (see below), whose sum is σ = 202099797100. Its totient is φ = 200342407104.

The previous prime is 201221102081. The next prime is 201221102171. The reversal of 201221102101 is 101201122102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 109793485201 + 91427616900 = 331351^2 + 302370^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201221102101 is a prime.

It is a super-2 number, since 2×201221102101² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221102171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439347156 + ... + 439347613.

It is an arithmetic number, because the mean of its divisors is an integer number (50524949275).

Almost surely, 2^201221102101 is an apocalyptic number.

It is an amenable number.

201221102101 is a deficient number, since it is larger than the sum of its proper divisors (878694999).

201221102101 is an equidigital number, since it uses as much as digits as its factorization.

201221102101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878694998.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 201221102101 its reverse (101201122102), we get a palindrome (302422224203).

The spelling of 201221102101 in words is "two hundred one billion, two hundred twenty-one million, one hundred two thousand, one hundred one".