201313121 has 4 divisors (see below), whose sum is σ = 203388612. Its totient is φ = 199237632.

The previous prime is 201313109. The next prime is 201313129. The reversal of 201313121 is 121313102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121313102 = 2 ⋅60656551.

It can be written as a sum of positive squares in 2 ways, for example, as 151413025 + 49900096 = 12305^2 + 7064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201313121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201313096 and 201313105.

It is not an unprimeable number, because it can be changed into a prime (201313129) 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, 1037600 + ... + 1037793.

It is an arithmetic number, because the mean of its divisors is an integer number (50847153).

Almost surely, 2^201313121 is an apocalyptic number.

It is an amenable number.

201313121 is a deficient number, since it is larger than the sum of its proper divisors (2075491).

201313121 is an equidigital number, since it uses as much as digits as its factorization.

201313121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075490.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 201313121 is about 14188.4855076220. The cubic root of 201313121 is about 586.0806198221.

Adding to 201313121 its reverse (121313102), we get a palindrome (322626223).

The spelling of 201313121 in words is "two hundred one million, three hundred thirteen thousand, one hundred twenty-one".