201121200121 has 2 divisors, whose sum is σ = 201121200122. Its totient is φ = 201121200120.

The previous prime is 201121200097. The next prime is 201121200139. The reversal of 201121200121 is 121002121102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 170124076521 + 30997123600 = 412461^2 + 176060^2 .

It is a cyclic number.

It is not a de Polignac number, because 201121200121 - 2¹⁷ = 201121069049 is a prime.

It is a super-3 number, since 3×201121200121³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (201121203121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100560600060 + 100560600061.

It is an arithmetic number, because the mean of its divisors is an integer number (100560600061).

Almost surely, 2^201121200121 is an apocalyptic number.

It is an amenable number.

201121200121 is a deficient number, since it is larger than the sum of its proper divisors (1).

201121200121 is an equidigital number, since it uses as much as digits as its factorization.

201121200121 is an odious number, because the sum of its binary digits is odd.

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

Adding to 201121200121 its reverse (121002121102), we get a palindrome (322123321223).

The spelling of 201121200121 in words is "two hundred one billion, one hundred twenty-one million, two hundred thousand, one hundred twenty-one".