201321121013 has 4 divisors (see below), whose sum is σ = 201347656620. Its totient is φ = 201294585408.

The previous prime is 201321120989. The next prime is 201321121019. The reversal of 201321121013 is 310121123102.

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 12011721604 + 189309399409 = 109598^2 + 435097^2 .

It is a cyclic number.

It is not a de Polignac number, because 201321121013 - 2²² = 201316926709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201321120982 and 201321121000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201321121019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13256420 + ... + 13271597.

It is an arithmetic number, because the mean of its divisors is an integer number (50336914155).

Almost surely, 2^201321121013 is an apocalyptic number.

It is an amenable number.

201321121013 is a deficient number, since it is larger than the sum of its proper divisors (26535607).

201321121013 is an equidigital number, since it uses as much as digits as its factorization.

201321121013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26535606.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 201321121013 its reverse (310121123102), we get a palindrome (511442244115).

The spelling of 201321121013 in words is "two hundred one billion, three hundred twenty-one million, one hundred twenty-one thousand, thirteen".