12806621 has 2 divisors, whose sum is σ = 12806622. Its totient is φ = 12806620.

The previous prime is 12806617. The next prime is 12806641. The reversal of 12806621 is 12660821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11978521 + 828100 = 3461^2 + 910^2 .

It is a cyclic number.

It is not a de Polignac number, because 12806621 - 2² = 12806617 is a prime.

It is a Chen prime.

It is equal to p₈₃₇₅₁₂ and since 12806621 and 837512 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12806641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6403310 + 6403311.

It is an arithmetic number, because the mean of its divisors is an integer number (6403311).

Almost surely, 2^12806621 is an apocalyptic number.

It is an amenable number.

12806621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12806621 is an equidigital number, since it uses as much as digits as its factorization.

12806621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 12806621 is about 3578.6339572524. The cubic root of 12806621 is about 233.9617452744.

The spelling of 12806621 in words is "twelve million, eight hundred six thousand, six hundred twenty-one".