221944 has 8 divisors (see below), whose sum is σ = 416160. Its totient is φ = 110968.

The previous prime is 221941. The next prime is 221951. The reversal of 221944 is 449122.

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 13864 + ... + 13879.

It is an arithmetic number, because the mean of its divisors is an integer number (52020).

2²²¹⁹⁴⁴ is an apocalyptic number.

It is an amenable number.

221944 is a deficient number, since it is larger than the sum of its proper divisors (194216).

221944 is a wasteful number, since it uses less digits than its factorization.

221944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27749 (or 27745 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 221944 is about 471.1093291371. The cubic root of 221944 is about 60.5453977045.

The spelling of 221944 in words is "two hundred twenty-one thousand, nine hundred forty-four".