201312443015521 has 16 divisors (see below), whose sum is σ = 215547032103040. Its totient is φ = 187446572651520.

The previous prime is 201312443015507. The next prime is 201312443015557. The reversal of 201312443015521 is 125510344213102.

It is a cyclic number.

It is not a de Polignac number, because 201312443015521 - 2⁹ = 201312443015009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201312443015821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65141760 + ... + 68162113.

It is an arithmetic number, because the mean of its divisors is an integer number (13471689506440).

Almost surely, 2^{201312443015521} is an apocalyptic number.

It is an amenable number.

201312443015521 is a deficient number, since it is larger than the sum of its proper divisors (14234589087519).

201312443015521 is a wasteful number, since it uses less digits than its factorization.

201312443015521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133305256.

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 201312443015521 its reverse (125510344213102), we get a palindrome (326822787228623).

The spelling of 201312443015521 in words is "two hundred one trillion, three hundred twelve billion, four hundred forty-three million, fifteen thousand, five hundred twenty-one".