221201202121101 has 6 divisors (see below), whose sum is σ = 319512847508270. Its totient is φ = 147467468080728.

The previous prime is 221201202121099. The next prime is 221201202121111. The reversal of 221201202121101 is 101121202102122.

221201202121101 is a `hidden beast` number, since 221 + 2 + 0 + 120 + 212 + 110 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 208325951117001 + 12875251004100 = 14433501^2 + 3588210^2 .

It is not a de Polignac number, because 221201202121101 - 2¹ = 221201202121099 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 (221201202121111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12288955673386 + ... + 12288955673403.

Almost surely, 2^{221201202121101} is an apocalyptic number.

It is an amenable number.

221201202121101 is a deficient number, since it is larger than the sum of its proper divisors (98311645387169).

221201202121101 is a wasteful number, since it uses less digits than its factorization.

221201202121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24577911346795 (or 24577911346792 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221201202121101 its reverse (101121202102122), we get a palindrome (322322404223223).

The spelling of 221201202121101 in words is "two hundred twenty-one trillion, two hundred one billion, two hundred two million, one hundred twenty-one thousand, one hundred one".