12721087 has 2 divisors, whose sum is σ = 12721088. Its totient is φ = 12721086.

The previous prime is 12721043. The next prime is 12721091. The reversal of 12721087 is 78012721.

It is a strong prime.

It is an emirp because it is prime and its reverse (78012721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12721087 - 2²³ = 4332479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12721097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6360543 + 6360544.

It is an arithmetic number, because the mean of its divisors is an integer number (6360544).

Almost surely, 2^12721087 is an apocalyptic number.

12721087 is a deficient number, since it is larger than the sum of its proper divisors (1).

12721087 is an equidigital number, since it uses as much as digits as its factorization.

12721087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 12721087 is about 3566.6632866028. The cubic root of 12721087 is about 233.4397131706.

The spelling of 12721087 in words is "twelve million, seven hundred twenty-one thousand, eighty-seven".