216741 has 8 divisors (see below), whose sum is σ = 330304. Its totient is φ = 123840.

The previous prime is 216731. The next prime is 216743. The reversal of 216741 is 147612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216741 - 2¹⁴ = 200357 is a prime.

It is a super-2 number, since 2×216741² = 93953322162, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 10321 = 216741 / (2 + 1 + 6 + 7 + 4 + 1).

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5140 + ... + 5181.

It is an arithmetic number, because the mean of its divisors is an integer number (41288).

2²¹⁶⁷⁴¹ is an apocalyptic number.

216741 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

216741 is a deficient number, since it is larger than the sum of its proper divisors (113563).

216741 is a wasteful number, since it uses less digits than its factorization.

216741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10331.

The product of its digits is 336, while the sum is 21.

The square root of 216741 is about 465.5545080869. The cubic root of 216741 is about 60.0685328022.

The spelling of 216741 in words is "two hundred sixteen thousand, seven hundred forty-one".