201120521717 has 4 divisors (see below), whose sum is σ = 201139450656. Its totient is φ = 201101592780.

The previous prime is 201120521711. The next prime is 201120521741. The reversal of 201120521717 is 717125021102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201120521717 - 2⁸ = 201120521461 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201120521717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201120521711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9448523 + ... + 9469784.

It is an arithmetic number, because the mean of its divisors is an integer number (50284862664).

Almost surely, 2^201120521717 is an apocalyptic number.

It is an amenable number.

201120521717 is a deficient number, since it is larger than the sum of its proper divisors (18928939).

201120521717 is a wasteful number, since it uses less digits than its factorization.

201120521717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18928938.

The product of its (nonzero) digits is 1960, while the sum is 29.

Adding to 201120521717 its reverse (717125021102), we get a palindrome (918245542819).

The spelling of 201120521717 in words is "two hundred one billion, one hundred twenty million, five hundred twenty-one thousand, seven hundred seventeen".