217101125438172 has 48 divisors (see below), whose sum is σ = 563218136628000. Its totient is φ = 72320323201920.

The previous prime is 217101125438123. The next prime is 217101125438213. The reversal of 217101125438172 is 271834521101712.

217101125438172 is a `hidden beast` number, since 2 + 1 + 7 + 1 + 0 + 11 + 254 + 381 + 7 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 648701529 + ... + 649036112.

It is an arithmetic number, because the mean of its divisors is an integer number (11733711179750).

Almost surely, 2^{217101125438172} is an apocalyptic number.

It is an amenable number.

217101125438172 is an abundant number, since it is smaller than the sum of its proper divisors (346117011189828).

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

217101125438172 is a wasteful number, since it uses less digits than its factorization.

217101125438172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297739203 (or 1297739195 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 45.

Adding to 217101125438172 its reverse (271834521101712), we get a palindrome (488935646539884).

The spelling of 217101125438172 in words is "two hundred seventeen trillion, one hundred one billion, one hundred twenty-five million, four hundred thirty-eight thousand, one hundred seventy-two".