217395949060 has 12 divisors (see below), whose sum is σ = 456531493068. Its totient is φ = 86958379616.

The previous prime is 217395949021. The next prime is 217395949063. The reversal of 217395949060 is 60949593712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 75238295616 + 142157653444 = 274296^2 + 377038^2 .

It is a super-2 number, since 2×217395949060² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 217395948992 and 217395949010.

It is not an unprimeable number, because it can be changed into a prime (217395949063) 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, 5434898707 + ... + 5434898746.

It is an arithmetic number, because the mean of its divisors is an integer number (38044291089).

Almost surely, 2^217395949060 is an apocalyptic number.

217395949060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217395949060 is an abundant number, since it is smaller than the sum of its proper divisors (239135544008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217395949060 is a wasteful number, since it uses less digits than its factorization.

217395949060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10869797462 (or 10869797460 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 55.

The spelling of 217395949060 in words is "two hundred seventeen billion, three hundred ninety-five million, nine hundred forty-nine thousand, sixty".