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121221211223 = 766653259813
BaseRepresentation
bin111000011100101011…
…0001110010001010111
3102120220010002120100202
41300321112032101113
53441230112224343
6131404355131115
711520655202660
oct1607126162127
9376803076322
10121221211223
11474562391a2
121b5b08a3a9b
13b57b1c7368
145c1d5d8367
1532472d0db8
hex1c3958e457

121221211223 has 8 divisors (see below), whose sum is σ = 138541138848. Its totient is φ = 103901936544.

The previous prime is 121221211159. The next prime is 121221211249. The reversal of 121221211223 is 322112122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121221211223 - 26 = 121221211159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121221211195 and 121221211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221211123) 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 in 7 ways as a sum of consecutive naturals, for example, 336665 + ... + 596477.

It is an arithmetic number, because the mean of its divisors is an integer number (17317642356).

Almost surely, 2121221211223 is an apocalyptic number.

121221211223 is a deficient number, since it is larger than the sum of its proper divisors (17319927625).

121221211223 is an equidigital number, since it uses as much as digits as its factorization.

121221211223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326473.

The product of its digits is 192, while the sum is 20.

Adding to 121221211223 its reverse (322112122121), we get a palindrome (443333333344).

The spelling of 121221211223 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, two hundred twenty-three".

Divisors: 1 7 66653 259813 466571 1818691 17317315889 121221211223