217251226112 has 30 divisors (see below), whose sum is σ = 434099207223. Its totient is φ = 108620339712.

The previous prime is 217251226103. The next prime is 217251226123. The reversal of 217251226112 is 211622152712.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 108625613056 + 108625613056 = 329584^2 + 329584^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=329584.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 10536389 + ... + 10556987.

Almost surely, 2^217251226112 is an apocalyptic number.

It is an amenable number.

217251226112 is a deficient number, since it is larger than the sum of its proper divisors (216847981111).

217251226112 is an frugal number, since it uses more digits than its factorization.

217251226112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41216 (or 20601 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

Multiplying 217251226112 by its sum of digits (32), we get a square (6952039235584 = 2636672²).

217251226112 divided by its sum of digits (32) gives a square (6789100816 = 82396²).

Adding to 217251226112 its reverse (211622152712), we get a palindrome (428873378824).

The spelling of 217251226112 in words is "two hundred seventeen billion, two hundred fifty-one million, two hundred twenty-six thousand, one hundred twelve".