12831021 has 32 divisors (see below), whose sum is σ = 22483200. Its totient is φ = 7076160.

The previous prime is 12831001. The next prime is 12831029. The reversal of 12831021 is 12013821.

12831021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12831021 - 2⁶ = 12830957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12830985 and 12831003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12831029) 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, 4311 + ... + 6651.

It is an arithmetic number, because the mean of its divisors is an integer number (702600).

Almost surely, 2^12831021 is an apocalyptic number.

It is an amenable number.

12831021 is a deficient number, since it is larger than the sum of its proper divisors (9652179).

12831021 is a wasteful number, since it uses less digits than its factorization.

12831021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386 (or 2380 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 12831021 is about 3582.0414570465. The cubic root of 12831021 is about 234.1102373424.

Adding to 12831021 its reverse (12013821), we get a palindrome (24844842).

It can be divided in two parts, 1283 and 1021, that added together give a square (2304 = 48²).

The spelling of 12831021 in words is "twelve million, eight hundred thirty-one thousand, twenty-one".