221394 has 8 divisors (see below), whose sum is σ = 442800. Its totient is φ = 73796.

The previous prime is 221393. The next prime is 221399. The reversal of 221394 is 493122.

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

221394 is an admirable number.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221394.

It is not an unprimeable number, because it can be changed into a prime (221393) 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, 18444 + ... + 18455.

It is an arithmetic number, because the mean of its divisors is an integer number (55350).

2²²¹³⁹⁴ is an apocalyptic number.

221394 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221394 is a wasteful number, since it uses less digits than its factorization.

221394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36904.

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

The square root of 221394 is about 470.5252384304. The cubic root of 221394 is about 60.4953437666.

The spelling of 221394 in words is "two hundred twenty-one thousand, three hundred ninety-four".