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220121 = 1120011
BaseRepresentation
bin110101101111011001
3102011221122
4311233121
524020441
64415025
71604516
oct655731
9364848
10220121
11140420
12a7475
1379265
145a30d
154534b
hex35bd9

220121 has 4 divisors (see below), whose sum is σ = 240144. Its totient is φ = 200100.

The previous prime is 220063. The next prime is 220123. The reversal of 220121 is 121022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220121 - 26 = 220057 is a prime.

It is an Ulam number.

It is a Duffinian number.

220121 is a modest number, since divided by 121 gives 22 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 220099 and 220108.

It is not an unprimeable number, because it can be changed into a prime (220123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9995 + ... + 10016.

It is an arithmetic number, because the mean of its divisors is an integer number (60036).

2220121 is an apocalyptic number.

It is an amenable number.

220121 is a deficient number, since it is larger than the sum of its proper divisors (20023).

220121 is a wasteful number, since it uses less digits than its factorization.

220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20022.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 220121 is about 469.1705446850. The cubic root of 220121 is about 60.3791728259.

Adding to 220121 its reverse (121022), we get a palindrome (341143).

Subtracting from 220121 its reverse (121022), we obtain a palindrome (99099).

It can be divided in two parts, 2201 and 21, that added together give a palindrome (2222).

The spelling of 220121 in words is "two hundred twenty thousand, one hundred twenty-one", and thus it is an iban number.

Divisors: 1 11 20011 220121