12531021 has 8 divisors (see below), whose sum is σ = 17434560. Its totient is φ = 7990752.

The previous prime is 12531019. The next prime is 12531041. The reversal of 12531021 is 12013521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12531021 - 2¹ = 12531019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12531041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90736 + ... + 90873.

It is an arithmetic number, because the mean of its divisors is an integer number (2179320).

Almost surely, 2^12531021 is an apocalyptic number.

It is an amenable number.

12531021 is a deficient number, since it is larger than the sum of its proper divisors (4903539).

12531021 is a wasteful number, since it uses less digits than its factorization.

12531021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181635.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 12531021 is about 3539.9182193943. The cubic root of 12531021 is about 232.2712653893.

Adding to 12531021 its reverse (12013521), we get a palindrome (24544542).

The spelling of 12531021 in words is "twelve million, five hundred thirty-one thousand, twenty-one".