217375420 has 12 divisors (see below), whose sum is σ = 456488424. Its totient is φ = 86950160.

The previous prime is 217375397. The next prime is 217375421. The reversal of 217375420 is 24573712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217375421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5434366 + ... + 5434405.

It is an arithmetic number, because the mean of its divisors is an integer number (38040702).

Almost surely, 2^217375420 is an apocalyptic number.

217375420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217375420 is an abundant number, since it is smaller than the sum of its proper divisors (239113004).

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

217375420 is a wasteful number, since it uses less digits than its factorization.

217375420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10868780 (or 10868778 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 217375420 is about 14743.6569412070. The cubic root of 217375420 is about 601.2708433984.

The spelling of 217375420 in words is "two hundred seventeen million, three hundred seventy-five thousand, four hundred twenty".