217213125818 has 32 divisors (see below), whose sum is σ = 352129462272. Its totient is φ = 99896544000.

The previous prime is 217213125799. The next prime is 217213125821. The reversal of 217213125818 is 818521312712.

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, 10321655 + ... + 10342677.

It is an arithmetic number, because the mean of its divisors is an integer number (11004045696).

Almost surely, 2^217213125818 is an apocalyptic number.

217213125818 is a deficient number, since it is larger than the sum of its proper divisors (134916336454).

217213125818 is a wasteful number, since it uses less digits than its factorization.

217213125818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22430.

The product of its digits is 53760, while the sum is 41.

The spelling of 217213125818 in words is "two hundred seventeen billion, two hundred thirteen million, one hundred twenty-five thousand, eight hundred eighteen".