221942 has 16 divisors (see below), whose sum is σ = 387072. Its totient is φ = 93480.

The previous prime is 221941. The next prime is 221951. The reversal of 221942 is 249122.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1067 + ... + 1257.

It is an arithmetic number, because the mean of its divisors is an integer number (24192).

2²²¹⁹⁴² is an apocalyptic number.

221942 is a deficient number, since it is larger than the sum of its proper divisors (165130).

221942 is a wasteful number, since it uses less digits than its factorization.

221942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283.

The product of its digits is 288, while the sum is 20.

The square root of 221942 is about 471.1072064828. The cubic root of 221942 is about 60.5452158401.

It can be divided in two parts, 22 and 1942, that multiplied together give a palindrome (42724).

The spelling of 221942 in words is "two hundred twenty-one thousand, nine hundred forty-two".