217251872040 has 64 divisors (see below), whose sum is σ = 744863564160. Its totient is φ = 49657570560.

The previous prime is 217251872023. The next prime is 217251872053. The reversal of 217251872040 is 40278152712.

It is a self number, because there is not a number n which added to its sum of digits gives 217251872040.

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, 129315751 + ... + 129317430.

It is an arithmetic number, because the mean of its divisors is an integer number (11638493190).

Almost surely, 2^217251872040 is an apocalyptic number.

217251872040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217251872040 is an abundant number, since it is smaller than the sum of its proper divisors (527611692120).

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

217251872040 is a wasteful number, since it uses less digits than its factorization.

217251872040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258633202 (or 258633198 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 39.

The spelling of 217251872040 in words is "two hundred seventeen billion, two hundred fifty-one million, eight hundred seventy-two thousand, forty".