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3121221003221 = 3126353511237
BaseRepresentation
bin101101011010110111010…
…001001110011111010101
3102001101102020222021111002
4231122313101032133111
5402114230034100341
610345511422153045
7441333523532456
oct55326721163725
912041366867432
103121221003221
11aa377a982672
12424ab6722785
13198439983689
14ab0d447912d
15562cb9d329b
hex2d6b744e7d5

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".

Divisors: 1 31 961 6353 196943 511237 6105233 15848347 491298757 3247888661 100684548491 3121221003221