201012121 has 2 divisors, whose sum is σ = 201012122. Its totient is φ = 201012120.

The previous prime is 201012113. The next prime is 201012151. The reversal of 201012121 is 121210102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129846025 + 71166096 = 11395^2 + 8436^2 .

It is a cyclic number.

It is not a de Polignac number, because 201012121 - 2³ = 201012113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201012098 and 201012107.

It is not a weakly prime, because it can be changed into another prime (201012101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100506060 + 100506061.

It is an arithmetic number, because the mean of its divisors is an integer number (100506061).

Almost surely, 2^201012121 is an apocalyptic number.

It is an amenable number.

201012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

201012121 is an equidigital number, since it uses as much as digits as its factorization.

201012121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 201012121 is about 14177.8743470240. The cubic root of 201012121 is about 585.7883748181.

Adding to 201012121 its reverse (121210102), we get a palindrome (322222223).

It can be divided in two parts, 20101 and 2121, that added together give a palindrome (22222).

The spelling of 201012121 in words is "two hundred one million, twelve thousand, one hundred twenty-one".