Base | Representation |
---|---|
bin | 101101011010110111010… |
… | …001001110011111010101 |
3 | 102001101102020222021111002 |
4 | 231122313101032133111 |
5 | 402114230034100341 |
6 | 10345511422153045 |
7 | 441333523532456 |
oct | 55326721163725 |
9 | 12041366867432 |
10 | 3121221003221 |
11 | aa377a982672 |
12 | 424ab6722785 |
13 | 198439983689 |
14 | ab0d447912d |
15 | 562cb9d329b |
hex | 2d6b744e7d5 |
3121221003221 has 12 divisors (see below), whose sum is σ = 3225667408236. Its totient is φ = 3020055096960.
The previous prime is 3121221003193. The next prime is 3121221003287. The reversal of 3121221003221 is 1223001221213.
It can be written as a sum of positive squares in 2 ways, for example, as 1423998302596 + 1697222700625 = 1193314^2 + 1302775^2 .
It is not a de Polignac number, because 3121221003221 - 214 = 3121220986837 is a prime.
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 = 3121221003193 and 3121221003202.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (3121221006221) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5849615 + ... + 6360851.
It is an arithmetic number, because the mean of its divisors is an integer number (268805617353).
Almost surely, 23121221003221 is an apocalyptic number.
3121221003221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.
It is an amenable number.
3121221003221 is a deficient number, since it is larger than the sum of its proper divisors (104446405015).
3121221003221 is an equidigital number, since it uses as much as digits as its factorization.
3121221003221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 517652 (or 517621 counting only the distinct ones).
The product of its (nonzero) digits is 288, while the sum is 20.
Adding to 3121221003221 its reverse (1223001221213), we get a palindrome (4344222224434).
The spelling of 3121221003221 in words is "three trillion, one hundred twenty-one billion, two hundred twenty-one million, three thousand, two hundred twenty-one".
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