201221201101 has 4 divisors (see below), whose sum is σ = 201223635804. Its totient is φ = 201218766400.

The previous prime is 201221201099. The next prime is 201221201107. The reversal of 201221201101 is 101102122102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101102122102 = 2 ⋅50551061051.

It can be written as a sum of positive squares in 2 ways, for example, as 85570875625 + 115650325476 = 292525^2 + 340074^2 .

It is a cyclic number.

It is not a de Polignac number, because 201221201101 - 2¹ = 201221201099 is a prime.

It is a super-2 number, since 2×201221201101² (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 (201221201107) 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, 1088860 + ... + 1260181.

It is an arithmetic number, because the mean of its divisors is an integer number (50305908951).

Almost surely, 2^201221201101 is an apocalyptic number.

It is an amenable number.

201221201101 is a deficient number, since it is larger than the sum of its proper divisors (2434703).

201221201101 is an equidigital number, since it uses as much as digits as its factorization.

201221201101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2434702.

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

Adding to 201221201101 its reverse (101102122102), we get a palindrome (302323323203).

The spelling of 201221201101 in words is "two hundred one billion, two hundred twenty-one million, two hundred one thousand, one hundred one".