12706021 has 8 divisors (see below), whose sum is σ = 13578840. Its totient is φ = 11847168.

The previous prime is 12706009. The next prime is 12706033. The reversal of 12706021 is 12060721.

It is an interprime number because it is at equal distance from previous prime (12706009) and next prime (12706033).

It can be written as a sum of positive squares in 4 ways, for example, as 1050625 + 11655396 = 1025^2 + 3414^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12706021 - 2¹³ = 12697829 is a prime.

It is a super-2 number, since 2×12706021² = 322885939304882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12706021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12706721) 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 7 ways as a sum of consecutive naturals, for example, 1576 + ... + 5281.

It is an arithmetic number, because the mean of its divisors is an integer number (1697355).

Almost surely, 2^12706021 is an apocalyptic number.

It is an amenable number.

12706021 is a deficient number, since it is larger than the sum of its proper divisors (872819).

12706021 is a wasteful number, since it uses less digits than its factorization.

12706021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6983.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 12706021 is about 3564.5506028110. The cubic root of 12706021 is about 233.3475199991.

Adding to 12706021 its reverse (12060721), we get a palindrome (24766742).

The spelling of 12706021 in words is "twelve million, seven hundred six thousand, twenty-one".