221137 has 6 divisors (see below), whose sum is σ = 257298.
Its totient is φ = 189504.
The previous prime is 221101. The next prime is 221159. The reversal of 221137 is 731122.
Adding to 221137 its reverse (731122), we get a palindrome (952259).
It is a happy number.
It can be written as a sum of positive squares in only one way, i.e., 112896 + 108241 = 336^2 + 329^2
It is not a de Polignac number, because 221137 - 215 = 188369 is a prime.
It is a Duffinian number.
221137 is a lucky number.
It is a self number, because there is not a number n which added to its sum of digits gives 221137.
It is not an unprimeable number, because it can be changed into a prime (221197) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2208 + ... + 2305.
It is an arithmetic number, because the mean of its divisors is an integer number (42883).
2221137 is an apocalyptic number.
221137 is the 272-nd hex number.
It is an amenable number.
221137 is a deficient number, since it is larger than the sum of its proper divisors (36161).
221137 is an equidigital number, since it uses as much as digits as its factorization.
221137 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4527 (or 4520 counting only the distinct ones).
The product of its digits is 84, while the sum is 16.
The square root of 221137 is about 470.2520600699.
The cubic root of 221137 is about 60.4719265058.
The spelling of 221137 in words is "two hundred twenty-one thousand, one hundred thirty-seven".