217885544140 has 96 divisors (see below), whose sum is σ = 515469846528. Its totient is φ = 76643712000.

The previous prime is 217885544137. The next prime is 217885544141. The reversal of 217885544140 is 41445588712.

It is a super-2 number, since 2×217885544140² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (217885544141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21934975 + ... + 21944905.

It is an arithmetic number, because the mean of its divisors is an integer number (5369477568).

Almost surely, 2^217885544140 is an apocalyptic number.

217885544140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217885544140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257734923264).

217885544140 is an abundant number, since it is smaller than the sum of its proper divisors (297584302388).

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

217885544140 is a wasteful number, since it uses less digits than its factorization.

217885544140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13199 (or 13197 counting only the distinct ones).

The product of its (nonzero) digits is 1433600, while the sum is 49.

The spelling of 217885544140 in words is "two hundred seventeen billion, eight hundred eighty-five million, five hundred forty-four thousand, one hundred forty".