217128922846 has 8 divisors (see below), whose sum is σ = 355301873784. Its totient is φ = 98694964920.

The previous prime is 217128922811. The next prime is 217128922847. The reversal of 217128922846 is 648229821712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 217128922793 and 217128922802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217128922847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4934748225 + ... + 4934748268.

It is an arithmetic number, because the mean of its divisors is an integer number (44412734223).

Almost surely, 2^217128922846 is an apocalyptic number.

217128922846 is a deficient number, since it is larger than the sum of its proper divisors (138172950938).

217128922846 is a wasteful number, since it uses less digits than its factorization.

217128922846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9869496506.

The product of its digits is 1548288, while the sum is 52.

The spelling of 217128922846 in words is "two hundred seventeen billion, one hundred twenty-eight million, nine hundred twenty-two thousand, eight hundred forty-six".