217051340 has 24 divisors (see below), whose sum is σ = 497245392. Its totient is φ = 78927680.

The previous prime is 217051339. The next prime is 217051349. The reversal of 217051340 is 43150712.

It is a super-2 number, since 2×217051340² = 94222568391591200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (217051349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493079 + ... + 493518.

It is an arithmetic number, because the mean of its divisors is an integer number (20718558).

Almost surely, 2^217051340 is an apocalyptic number.

217051340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217051340 is an abundant number, since it is smaller than the sum of its proper divisors (280194052).

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

217051340 is a wasteful number, since it uses less digits than its factorization.

217051340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986617 (or 986615 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 217051340 is about 14732.6623527453. The cubic root of 217051340 is about 600.9718878363.

The spelling of 217051340 in words is "two hundred seventeen million, fifty-one thousand, three hundred forty".