221142 has 8 divisors (see below), whose sum is σ = 442296. Its totient is φ = 73712.

The previous prime is 221101. The next prime is 221159. The reversal of 221142 is 241122.

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

221142 is an admirable number.

It is a plaindrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 221142.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18423 + ... + 18434.

It is an arithmetic number, because the mean of its divisors is an integer number (55287).

2²²¹¹⁴² is an apocalyptic number.

221142 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.

221142 is a wasteful number, since it uses less digits than its factorization.

221142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36862.

The product of its digits is 32, while the sum is 12.

The square root of 221142 is about 470.2573763377. The cubic root of 221142 is about 60.4723822675.

Adding to 221142 its reverse (241122), we get a palindrome (462264).

It can be divided in two parts, 221 and 142, that added together give a palindrome (363).

The spelling of 221142 in words is "two hundred twenty-one thousand, one hundred forty-two", and thus it is an iban number.