217035199172 has 36 divisors (see below), whose sum is σ = 417518587500. Its totient is φ = 98642976960.

The previous prime is 217035199169. The next prime is 217035199273. The reversal of 217035199172 is 271991530712.

It can be written as a sum of positive squares in 2 ways, for example, as 136392830596 + 80642368576 = 369314^2 + 283976^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9062558 + ... + 9086474.

Almost surely, 2^217035199172 is an apocalyptic number.

217035199172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

217035199172 is a deficient number, since it is larger than the sum of its proper divisors (200483388328).

217035199172 is a wasteful number, since it uses less digits than its factorization.

217035199172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42692 (or 42679 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 47.

The spelling of 217035199172 in words is "two hundred seventeen billion, thirty-five million, one hundred ninety-nine thousand, one hundred seventy-two".