221943 has 8 divisors (see below), whose sum is σ = 298368. Its totient is φ = 146744.

The previous prime is 221941. The next prime is 221951. The reversal of 221943 is 349122.

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

It is a cyclic number.

It is not a de Polignac number, because 221943 - 2¹ = 221941 is a prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221941) 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, 280 + ... + 722.

It is an arithmetic number, because the mean of its divisors is an integer number (37296).

2²²¹⁹⁴³ is an apocalyptic number.

221943 is a deficient number, since it is larger than the sum of its proper divisors (76425).

221943 is a wasteful number, since it uses less digits than its factorization.

221943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613.

The product of its digits is 432, while the sum is 21.

The square root of 221943 is about 471.1082678111. The cubic root of 221943 is about 60.5453067724.

It can be divided in two parts, 2 and 21943, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 221943 in words is "two hundred twenty-one thousand, nine hundred forty-three".