201221650717 has 8 divisors (see below), whose sum is σ = 202435107840. Its totient is φ = 200008772400.

The previous prime is 201221650639. The next prime is 201221650733. The reversal of 201221650717 is 717056122102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 201221650717 - 2²⁷ = 201087432989 is a prime.

It is a super-2 number, since 2×201221650717² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221650757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 563092 + ... + 848242.

It is an arithmetic number, because the mean of its divisors is an integer number (25304388480).

Almost surely, 2^201221650717 is an apocalyptic number.

It is an amenable number.

201221650717 is a deficient number, since it is larger than the sum of its proper divisors (1213457123).

201221650717 is a wasteful number, since it uses less digits than its factorization.

201221650717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289403.

The product of its (nonzero) digits is 11760, while the sum is 34.

Adding to 201221650717 its reverse (717056122102), we get a palindrome (918277772819).

The spelling of 201221650717 in words is "two hundred one billion, two hundred twenty-one million, six hundred fifty thousand, seven hundred seventeen".