221030 has 24 divisors (see below), whose sum is σ = 428976. Its totient is φ = 81840.
The previous prime is 221021. The next prime is 221047. The reversal of 221030 is 30122.
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 220999 and 221017.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7115 + ... + 7145.
It is an arithmetic number, because the mean of its divisors is an integer number (17874).
2221030 is an apocalyptic number.
221030 is a deficient number, since it is larger than the sum of its proper divisors (207946).
221030 is a wasteful number, since it uses less digits than its factorization.
221030 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 92 (or 61 counting only the distinct ones).
The product of its (nonzero) digits is 12, while the sum is 8.
The square root of 221030 is about 470.1382775312. The cubic root of 221030 is about 60.4621715574.
Adding to 221030 its reverse (30122), we get a palindrome (251152).
The spelling of 221030 in words is "two hundred twenty-one thousand, thirty".
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