12287121 has 32 divisors (see below), whose sum is σ = 20917248. Its totient is φ = 6229440.

The previous prime is 12287117. The next prime is 12287137. The reversal of 12287121 is 12178221.

It is not a de Polignac number, because 12287121 - 2² = 12287117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12287091 and 12287100.

It is not an unprimeable number, because it can be changed into a prime (12287101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9315 + ... + 10551.

It is an arithmetic number, because the mean of its divisors is an integer number (653664).

Almost surely, 2^12287121 is an apocalyptic number.

12287121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12287121 is a deficient number, since it is larger than the sum of its proper divisors (8630127).

12287121 is a wasteful number, since it uses less digits than its factorization.

12287121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301.

The product of its digits is 448, while the sum is 24.

The square root of 12287121 is about 3505.2989886741. The cubic root of 12287121 is about 230.7544287856.

Subtracting from 12287121 its reverse (12178221), we obtain a square (108900 = 330²).

The spelling of 12287121 in words is "twelve million, two hundred eighty-seven thousand, one hundred twenty-one".