Base | Representation |
---|---|
bin | 1000000101110111111010 |
3 | 10222202202100 |
4 | 20011313322 |
5 | 1020334320 |
6 | 113244230 |
7 | 24013200 |
oct | 10056772 |
9 | 3882670 |
10 | 2121210 |
11 | 1219773 |
12 | 863676 |
13 | 593670 |
14 | 3d3070 |
15 | 2bd790 |
hex | 205dfa |
2121210 has 144 divisors (see below), whose sum is σ = 7095816. Its totient is φ = 435456.
The previous prime is 2121199. The next prime is 2121239. The reversal of 2121210 is 121212.
2121210 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.
It can be written as a sum of positive squares in 4 ways, for example, as 1750329 + 370881 = 1323^2 + 609^2 .
It is a super-3 number, since 3×21212103 = 28633355956342683000, which contains 333 as substring.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is an alternating number because its digits alternate between even and odd.
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 2121192 and 2121201.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 57312 + ... + 57348.
22121210 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 2121210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3547908).
2121210 is an abundant number, since it is smaller than the sum of its proper divisors (4974606).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2121210 is a wasteful number, since it uses less digits than its factorization.
2121210 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 77 (or 67 counting only the distinct ones).
The product of its (nonzero) digits is 8, while the sum is 9.
The square root of 2121210 is about 1456.4374342896. The cubic root of 2121210 is about 128.4876014422.
Adding to 2121210 its reverse (121212), we get a palindrome (2242422).
The spelling of 2121210 in words is "two million, one hundred twenty-one thousand, two hundred ten".
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