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1221200001209 is a prime number
BaseRepresentation
bin10001110001010101001…
…100010011100010111001
311022202010112020202102102
4101301111030103202321
5130002004200014314
62333002254113145
7154141321511516
oct21612514234271
94282115222372
101221200001209
114309a9622851
121788154ab7b5
138b20a787516
144316bd4030d
1521b75e925de
hex11c553138b9

1221200001209 has 2 divisors, whose sum is σ = 1221200001210. Its totient is φ = 1221200001208.

The previous prime is 1221200001191. The next prime is 1221200001227. The reversal of 1221200001209 is 9021000021221.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (1221200001191) and next prime (1221200001227).

It can be written as a sum of positive squares in only one way, i.e., 1028544845584 + 192655155625 = 1014172^2 + 438925^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221200001209 - 224 = 1221183223993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221200001409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610600000604 + 610600000605.

It is an arithmetic number, because the mean of its divisors is an integer number (610600000605).

Almost surely, 21221200001209 is an apocalyptic number.

It is an amenable number.

1221200001209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221200001209 is an equidigital number, since it uses as much as digits as its factorization.

1221200001209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 1221200001209 in words is "one trillion, two hundred twenty-one billion, two hundred million, one thousand, two hundred nine".