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220521 = 3710501
BaseRepresentation
bin110101110101101001
3102012111110
4311311221
524024041
64420533
71605630
oct656551
9365443
10220521
11140754
12a7749
13794b2
145a517
1545516
hex35d69

220521 has 8 divisors (see below), whose sum is σ = 336064. Its totient is φ = 126000.

The previous prime is 220513. The next prime is 220529. The reversal of 220521 is 125022.

It is an interprime number because it is at equal distance from previous prime (220513) and next prime (220529).

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

It is not a de Polignac number, because 220521 - 23 = 220513 is a prime.

It is a super-2 number, since 2×2205212 = 97259022882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220497 and 220506.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 220521.

It is not an unprimeable number, because it can be changed into a prime (220529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5230 + ... + 5271.

It is an arithmetic number, because the mean of its divisors is an integer number (42008).

2220521 is an apocalyptic number.

220521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

220521 is a deficient number, since it is larger than the sum of its proper divisors (115543).

220521 is a wasteful number, since it uses less digits than its factorization.

220521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10511.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 220521 is about 469.5966354224. The cubic root of 220521 is about 60.4157240175.

Adding to 220521 its reverse (125022), we get a palindrome (345543).

It can be divided in two parts, 220 and 521, that added together give a triangular number (741 = T38).

The spelling of 220521 in words is "two hundred twenty thousand, five hundred twenty-one".

Divisors: 1 3 7 21 10501 31503 73507 220521