217130177220 has 96 divisors (see below), whose sum is σ = 665700094080. Its totient is φ = 52441896960.

The previous prime is 217130177203. The next prime is 217130177227. The reversal of 217130177220 is 22771031712.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (217130177227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 433957 + ... + 789036.

It is an arithmetic number, because the mean of its divisors is an integer number (6934375980).

Almost surely, 2^217130177220 is an apocalyptic number.

217130177220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217130177220 is an abundant number, since it is smaller than the sum of its proper divisors (448569916860).

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

217130177220 is a wasteful number, since it uses less digits than its factorization.

217130177220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223285 (or 1223283 counting only the distinct ones).

The product of its (nonzero) digits is 8232, while the sum is 33.

The spelling of 217130177220 in words is "two hundred seventeen billion, one hundred thirty million, one hundred seventy-seven thousand, two hundred twenty".