12706521 has 8 divisors (see below), whose sum is σ = 16961184. Its totient is φ = 8461440.

The previous prime is 12706517. The next prime is 12706567. The reversal of 12706521 is 12560721.

12706521 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12706521 - 2² = 12706517 is a prime.

It is a super-2 number, since 2×12706521² = 322911351846882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12706491 and 12706500.

It is not an unprimeable number, because it can be changed into a prime (12706501) 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, 1705 + ... + 5321.

It is an arithmetic number, because the mean of its divisors is an integer number (2120148).

Almost surely, 2^12706521 is an apocalyptic number.

It is an amenable number.

12706521 is a deficient number, since it is larger than the sum of its proper divisors (4254663).

12706521 is a wasteful number, since it uses less digits than its factorization.

12706521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4791.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 12706521 is about 3564.6207371893. The cubic root of 12706521 is about 233.3505808112.

The spelling of 12706521 in words is "twelve million, seven hundred six thousand, five hundred twenty-one".