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12108121 = 54122381
BaseRepresentation
bin101110001100…
…000101011001
3211210011012221
4232030011121
511044424441
61111304041
7204626434
oct56140531
924704187
1012108121
116920013
12407b021
13267c28c
14187281b
1510e28d1
hexb8c159

12108121 has 4 divisors (see below), whose sum is σ = 12131044. Its totient is φ = 12085200.

The previous prime is 12108113. The next prime is 12108133. The reversal of 12108121 is 12180121.

12108121 = 24602 + 24612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6056521 + 6051600 = 2461^2 + 2460^2 .

It is a cyclic number.

It is not a de Polignac number, because 12108121 - 23 = 12108113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12108095 and 12108104.

It is not an unprimeable number, because it can be changed into a prime (12108181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10650 + ... + 11731.

It is an arithmetic number, because the mean of its divisors is an integer number (3032761).

Almost surely, 212108121 is an apocalyptic number.

12108121 is the 2461-st centered square number.

It is an amenable number.

12108121 is a deficient number, since it is larger than the sum of its proper divisors (22923).

12108121 is an equidigital number, since it uses as much as digits as its factorization.

12108121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22922.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 12108121 is about 3479.6725420648. The cubic root of 12108121 is about 229.6283917287.

Adding to 12108121 its reverse (12180121), we get a palindrome (24288242).

The spelling of 12108121 in words is "twelve million, one hundred eight thousand, one hundred twenty-one".

Divisors: 1 541 22381 12108121