221442 has 32 divisors (see below), whose sum is σ = 508032. Its totient is φ = 63744.

The previous prime is 221413. The next prime is 221447. The reversal of 221442 is 244122.

It is not an unprimeable number, because it can be changed into a prime (221447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1243 + ... + 1409.

It is an arithmetic number, because the mean of its divisors is an integer number (15876).

2²²¹⁴⁴² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254016).

221442 is an abundant number, since it is smaller than the sum of its proper divisors (286590).

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

221442 is a wasteful number, since it uses less digits than its factorization.

221442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202.

The product of its digits is 128, while the sum is 15.

The square root of 221442 is about 470.5762424942. The cubic root of 221442 is about 60.4997154097.

Adding to 221442 its reverse (244122), we get a palindrome (465564).

The spelling of 221442 in words is "two hundred twenty-one thousand, four hundred forty-two", and thus it is an iban number.