201201112121 has 2 divisors, whose sum is σ = 201201112122. Its totient is φ = 201201112120.

The previous prime is 201201112111. The next prime is 201201112127. The reversal of 201201112121 is 121211102102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134076074896 + 67125037225 = 366164^2 + 259085^2 .

It is a cyclic number.

It is not a de Polignac number, because 201201112121 - 2¹⁸ = 201200849977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201201112096 and 201201112105.

It is not a weakly prime, because it can be changed into another prime (201201112127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100600556060 + 100600556061.

It is an arithmetic number, because the mean of its divisors is an integer number (100600556061).

Almost surely, 2^201201112121 is an apocalyptic number.

It is an amenable number.

201201112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

201201112121 is an equidigital number, since it uses as much as digits as its factorization.

201201112121 is an evil number, because the sum of its binary digits is even.

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

Adding to 201201112121 its reverse (121211102102), we get a palindrome (322412214223).

The spelling of 201201112121 in words is "two hundred one billion, two hundred one million, one hundred twelve thousand, one hundred twenty-one".