201121101112221 has 20 divisors (see below), whose sum is σ = 300440679056892. Its totient is φ = 134080503942528.

The previous prime is 201121101112207. The next prime is 201121101112247. The reversal of 201121101112221 is 122211101121102.

It is a happy number.

201121101112221 is a `hidden beast` number, since 201 + 121 + 10 + 1 + 112 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 174980275016121 + 26140826096100 = 13228011^2 + 5112810^2 .

It is not a de Polignac number, because 201121101112221 - 2⁶ = 201121101112157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201121101112194 and 201121101112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121101112201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 54628435 + ... + 58193711.

Almost surely, 2^{201121101112221} is an apocalyptic number.

It is an amenable number.

201121101112221 is a deficient number, since it is larger than the sum of its proper divisors (99319577944671).

201121101112221 is an equidigital number, since it uses as much as digits as its factorization.

201121101112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4261722 (or 4261713 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 201121101112221 its reverse (122211101121102), we get a palindrome (323332202233323).

The spelling of 201121101112221 in words is "two hundred one trillion, one hundred twenty-one billion, one hundred one million, one hundred twelve thousand, two hundred twenty-one".