12716021 has 8 divisors (see below), whose sum is σ = 12918360. Its totient is φ = 12515328.

The previous prime is 12716009. The next prime is 12716023. The reversal of 12716021 is 12061721.

12716021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 148996 + 12567025 = 386^2 + 3545^2 .

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

It is not a de Polignac number, because 12716021 - 2¹⁴ = 12699637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12715984 and 12716002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12716023) 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, 32495 + ... + 32883.

It is an arithmetic number, because the mean of its divisors is an integer number (1614795).

Almost surely, 2^12716021 is an apocalyptic number.

It is an amenable number.

12716021 is a deficient number, since it is larger than the sum of its proper divisors (202339).

12716021 is an equidigital number, since it uses as much as digits as its factorization.

12716021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 12716021 is about 3565.9530282941. The cubic root of 12716021 is about 233.4087209919.

Adding to 12716021 its reverse (12061721), we get a palindrome (24777742).

The spelling of 12716021 in words is "twelve million, seven hundred sixteen thousand, twenty-one".