12707121 has 32 divisors (see below), whose sum is σ = 20217600. Its totient is φ = 7093632.

The previous prime is 12707119. The next prime is 12707129. The reversal of 12707121 is 12170721.

It is a happy number.

It is not a de Polignac number, because 12707121 - 2¹ = 12707119 is a prime.

It is a super-2 number, since 2×12707121² = 322941848217282, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12707129) 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 31 ways as a sum of consecutive naturals, for example, 54421 + ... + 54653.

It is an arithmetic number, because the mean of its divisors is an integer number (631800).

Almost surely, 2^12707121 is an apocalyptic number.

It is an amenable number.

12707121 is a deficient number, since it is larger than the sum of its proper divisors (7510479).

12707121 is an equidigital number, since it uses as much as digits as its factorization.

12707121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 12707121 is about 3564.7048966219. The cubic root of 12707121 is about 233.3542536798.

Adding to 12707121 its reverse (12170721), we get a palindrome (24877842).

The spelling of 12707121 in words is "twelve million, seven hundred seven thousand, one hundred twenty-one".