12786467621 has 2 divisors, whose sum is σ = 12786467622. Its totient is φ = 12786467620.

The previous prime is 12786467609. The next prime is 12786467623. The reversal of 12786467621 is 12676468721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9232519396 + 3553948225 = 96086^2 + 59615^2 .

It is a cyclic number.

It is not a de Polignac number, because 12786467621 - 2⁶ = 12786467557 is a prime.

Together with 12786467623, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12786467621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12786467623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6393233810 + 6393233811.

It is an arithmetic number, because the mean of its divisors is an integer number (6393233811).

Almost surely, 2^12786467621 is an apocalyptic number.

It is an amenable number.

12786467621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12786467621 is an equidigital number, since it uses as much as digits as its factorization.

12786467621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 50.

The spelling of 12786467621 in words is "twelve billion, seven hundred eighty-six million, four hundred sixty-seven thousand, six hundred twenty-one".