Search a number
-
+
2121211 = 3476113
BaseRepresentation
bin1000000101110111111011
310222202202101
420011313323
51020334321
6113244231
724013201
oct10056773
93882671
102121211
111219774
12863677
13593671
143d3071
152bd791
hex205dfb

2121211 has 4 divisors (see below), whose sum is σ = 2127672. Its totient is φ = 2114752.

The previous prime is 2121199. The next prime is 2121239. The reversal of 2121211 is 1121212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-2121211 is a prime.

It is a super-3 number, since 3×21212113 = 28633396452148550793, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

2121211 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2121241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2710 + ... + 3403.

It is an arithmetic number, because the mean of its divisors is an integer number (531918).

22121211 is an apocalyptic number.

2121211 is a deficient number, since it is larger than the sum of its proper divisors (6461).

2121211 is an equidigital number, since it uses as much as digits as its factorization.

2121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6460.

The product of its digits is 8, while the sum is 10.

The square root of 2121211 is about 1456.4377775930. The cubic root of 2121211 is about 128.4876216331.

Adding to 2121211 its reverse (1121212), we get a palindrome (3242423).

Subtracting from 2121211 its reverse (1121212), we obtain a palindrome (999999).

It can be divided in two parts, 21212 and 11, that multiplied together give a palindrome (233332).

The spelling of 2121211 in words is "two million, one hundred twenty-one thousand, two hundred eleven".

Divisors: 1 347 6113 2121211