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201211122221 is a prime number
BaseRepresentation
bin1011101101100100011…
…1100001001000101101
3201020100202020001211222
42323121013201020231
511244040021402341
6232233552353125
720352125214404
oct2733107411055
9636322201758
10201211122221
117837348425a
1232bb52457a5
1315c88208c45
149a4aca863b
15537995a44b
hex2ed91e122d

201211122221 has 2 divisors, whose sum is σ = 201211122222. Its totient is φ = 201211122220.

The previous prime is 201211122209. The next prime is 201211122241. The reversal of 201211122221 is 122221112102.

201211122221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187152277321 + 14058844900 = 432611^2 + 118570^2 .

It is a cyclic number.

It is not a de Polignac number, because 201211122221 - 230 = 200137380397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201211122221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201211122241) 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, 100605561110 + 100605561111.

It is an arithmetic number, because the mean of its divisors is an integer number (100605561111).

Almost surely, 2201211122221 is an apocalyptic number.

It is an amenable number.

201211122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

201211122221 is an equidigital number, since it uses as much as digits as its factorization.

201211122221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 201211122221 its reverse (122221112102), we get a palindrome (323432234323).

The spelling of 201211122221 in words is "two hundred one billion, two hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".