217257223271128 has 8 divisors (see below), whose sum is σ = 407357293633380. Its totient is φ = 108628611635560.

The previous prime is 217257223271107. The next prime is 217257223271131. The reversal of 217257223271128 is 821172322752712.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13578576454438 + ... + 13578576454453.

Almost surely, 2^{217257223271128} is an apocalyptic number.

It is an amenable number.

217257223271128 is a deficient number, since it is larger than the sum of its proper divisors (190100070362252).

217257223271128 is a wasteful number, since it uses less digits than its factorization.

217257223271128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27157152908897 (or 27157152908893 counting only the distinct ones).

The product of its digits is 2634240, while the sum is 52.

The spelling of 217257223271128 in words is "two hundred seventeen trillion, two hundred fifty-seven billion, two hundred twenty-three million, two hundred seventy-one thousand, one hundred twenty-eight".