12721124 has 12 divisors (see below), whose sum is σ = 23974524. Its totient is φ = 5871264.

The previous prime is 12721103. The next prime is 12721147. The reversal of 12721124 is 42112721.

It can be written as a sum of positive squares in 2 ways, for example, as 1364224 + 11356900 = 1168^2 + 3370^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12721096 and 12721105.

It is an unprimeable number.

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, 122267 + ... + 122370.

It is an arithmetic number, because the mean of its divisors is an integer number (1997877).

Almost surely, 2^12721124 is an apocalyptic number.

It is an amenable number.

12721124 is a deficient number, since it is larger than the sum of its proper divisors (11253400).

12721124 is a wasteful number, since it uses less digits than its factorization.

12721124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244654 (or 244652 counting only the distinct ones).

The product of its digits is 224, while the sum is 20.

The square root of 12721124 is about 3566.6684735198. The cubic root of 12721124 is about 233.4399394946.

Adding to 12721124 its reverse (42112721), we get a palindrome (54833845).

It can be divided in two parts, 1272112 and 4, that multiplied together give a cube (5088448 = 172³).

The spelling of 12721124 in words is "twelve million, seven hundred twenty-one thousand, one hundred twenty-four".