Search a number
-
+
121221211221 = 32114992453821
BaseRepresentation
bin111000011100101011…
…0001110010001010101
3102120220010002120100200
41300321112032101111
53441230112224341
6131404355131113
711520655202655
oct1607126162125
9376803076320
10121221211221
11474562391a0
121b5b08a3a99
13b57b1c7366
145c1d5d8365
1532472d0db6
hex1c3958e455

121221211221 has 24 divisors (see below), whose sum is σ = 191398116000. Its totient is φ = 73320141600.

The previous prime is 121221211159. The next prime is 121221211249. The reversal of 121221211221 is 122112122121.

121221211221 is a `hidden beast` number, since 1 + 212 + 21 + 211 + 221 = 666.

It is not a de Polignac number, because 121221211221 - 221 = 121219114069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121221211194 and 121221211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221211271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1177510 + ... + 1276311.

It is an arithmetic number, because the mean of its divisors is an integer number (7974921500).

Almost surely, 2121221211221 is an apocalyptic number.

121221211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121221211221 is a deficient number, since it is larger than the sum of its proper divisors (70176904779).

121221211221 is a wasteful number, since it uses less digits than its factorization.

121221211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2454337 (or 2454334 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 121221211221 its reverse (122112122121), we get a palindrome (243333333342).

The spelling of 121221211221 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, two hundred twenty-one".

Divisors: 1 3 9 11 33 99 499 1497 4491 5489 16467 49401 2453821 7361463 22084389 26992031 80976093 242928279 1224456679 3673370037 11020110111 13469023469 40407070407 121221211221