202117165221 has 16 divisors (see below), whose sum is σ = 285474077568. Its totient is φ = 126759859200.

The previous prime is 202117165193. The next prime is 202117165273. The reversal of 202117165221 is 122561711202.

It is a happy number.

It is not a de Polignac number, because 202117165221 - 2¹³ = 202117157029 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202117165121) 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, 806745 + ... + 1027166.

It is an arithmetic number, because the mean of its divisors is an integer number (17842129848).

Almost surely, 2^202117165221 is an apocalyptic number.

It is an amenable number.

202117165221 is a deficient number, since it is larger than the sum of its proper divisors (83356912347).

202117165221 is a wasteful number, since it uses less digits than its factorization.

202117165221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836092.

The product of its (nonzero) digits is 3360, while the sum is 30.

Adding to 202117165221 its reverse (122561711202), we get a palindrome (324678876423).

The spelling of 202117165221 in words is "two hundred two billion, one hundred seventeen million, one hundred sixty-five thousand, two hundred twenty-one".