201121102121 has 4 divisors (see below), whose sum is σ = 201192908244. Its totient is φ = 201049296000.

The previous prime is 201121102103. The next prime is 201121102129. The reversal of 201121102121 is 121201121102.

201121102121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121201121102 = 2 ⋅60600560551.

It can be written as a sum of positive squares in 2 ways, for example, as 165352836496 + 35768265625 = 406636^2 + 189125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201121102121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201121102096 and 201121102105.

It is not an unprimeable number, because it can be changed into a prime (201121102129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35898860 + ... + 35904461.

It is an arithmetic number, because the mean of its divisors is an integer number (50298227061).

Almost surely, 2^201121102121 is an apocalyptic number.

It is an amenable number.

201121102121 is a deficient number, since it is larger than the sum of its proper divisors (71806123).

201121102121 is an equidigital number, since it uses as much as digits as its factorization.

201121102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71806122.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 201121102121 its reverse (121201121102), we get a palindrome (322322223223).

It can be divided in two parts, 201121102 and 121, that multiplied together give a palindrome (24335653342).

The spelling of 201121102121 in words is "two hundred one billion, one hundred twenty-one million, one hundred two thousand, one hundred twenty-one".