217140912 has 60 divisors (see below), whose sum is σ = 630211400. Its totient is φ = 72379008.

The previous prime is 217140899. The next prime is 217140919. The reversal of 217140912 is 219041712.

217140912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217140919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24037 + ... + 31812.

Almost surely, 2^217140912 is an apocalyptic number.

It is an amenable number.

217140912 is an abundant number, since it is smaller than the sum of its proper divisors (413070488).

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

217140912 is an equidigital number, since it uses as much as digits as its factorization.

217140912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55872 (or 55854 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 217140912 is about 14735.7019513832. The cubic root of 217140912 is about 601.0545454706.

The spelling of 217140912 in words is "two hundred seventeen million, one hundred forty thousand, nine hundred twelve".