201121202100121 has 4 divisors (see below), whose sum is σ = 201121540872244. Its totient is φ = 201120863328000.

The previous prime is 201121202100113. The next prime is 201121202100209. The reversal of 201121202100121 is 121001202121102.

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 161889080862096 + 39232121238025 = 12723564^2 + 6263555^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121202100121 - 2³ = 201121202100113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201121202100095 and 201121202100104.

It is not an unprimeable number, because it can be changed into a prime (201121208100121) 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, 168493980 + ... + 169683421.

It is an arithmetic number, because the mean of its divisors is an integer number (50280385218061).

Almost surely, 2^{201121202100121} is an apocalyptic number.

It is an amenable number.

201121202100121 is a deficient number, since it is larger than the sum of its proper divisors (338772123).

201121202100121 is an equidigital number, since it uses as much as digits as its factorization.

201121202100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338772122.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201121202100121 its reverse (121001202121102), we get a palindrome (322122404221223).

The spelling of 201121202100121 in words is "two hundred one trillion, one hundred twenty-one billion, two hundred two million, one hundred thousand, one hundred twenty-one".