217128890196 has 48 divisors (see below), whose sum is σ = 562960339200. Its totient is φ = 72371978496.

The previous prime is 217128890191. The next prime is 217128890201. The reversal of 217128890196 is 691098821712.

It is a happy number.

217128890196 is a `hidden beast` number, since 2 + 171 + 288 + 9 + 0 + 196 = 666.

It is an interprime number because it is at equal distance from previous prime (217128890191) and next prime (217128890201).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217128890191) 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, 2125540 + ... + 2225348.

It is an arithmetic number, because the mean of its divisors is an integer number (11728340400).

Almost surely, 2^217128890196 is an apocalyptic number.

It is an amenable number.

217128890196 is an abundant number, since it is smaller than the sum of its proper divisors (345831449004).

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

217128890196 is a wasteful number, since it uses less digits than its factorization.

217128890196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119965 (or 119957 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The spelling of 217128890196 in words is "two hundred seventeen billion, one hundred twenty-eight million, eight hundred ninety thousand, one hundred ninety-six".