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BaseRepresentation
bin1000011001011010000101
311010211111201
420121122011
51030414341
6115102501
724465361
oct10313205
94124451
102201221
1112738a0
128a1a31
135c0bc9
144142a1
152d7331
hex219685

2201221 has 8 divisors (see below), whose sum is σ = 2427264. Its totient is φ = 1979520.

The previous prime is 2201209. The next prime is 2201273. The reversal of 2201221 is 1221022.

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

It is a cyclic number.

It is not a de Polignac number, because 2201221 - 25 = 2201189 is a prime.

It is a Duffinian number.

2201221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2201198 and 2201207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36 + ... + 2098.

It is an arithmetic number, because the mean of its divisors is an integer number (303408).

22201221 is an apocalyptic number.

It is an amenable number.

2201221 is a deficient number, since it is larger than the sum of its proper divisors (226043).

2201221 is a wasteful number, since it uses less digits than its factorization.

2201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2201221 is about 1483.6512393416. The cubic root of 2201221 is about 130.0832011770.

Adding to 2201221 its reverse (1221022), we get a palindrome (3422243).

It can be divided in two parts, 220 and 1221, that added together give a palindrome (1441).

The spelling of 2201221 in words is "two million, two hundred one thousand, two hundred twenty-one".

Divisors: 1 11 97 1067 2063 22693 200111 2201221