12721147 has 2 divisors, whose sum is σ = 12721148. Its totient is φ = 12721146.

The previous prime is 12721103. The next prime is 12721157. The reversal of 12721147 is 74112721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12721147 - 2⁷ = 12721019 is a prime.

It is not a weakly prime, because it can be changed into another prime (12721157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6360573 + 6360574.

It is an arithmetic number, because the mean of its divisors is an integer number (6360574).

Almost surely, 2^12721147 is an apocalyptic number.

12721147 is a deficient number, since it is larger than the sum of its proper divisors (1).

12721147 is an equidigital number, since it uses as much as digits as its factorization.

12721147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 784, while the sum is 25.

The square root of 12721147 is about 3566.6716978158. The cubic root of 12721147 is about 233.4400801823.

Adding to 12721147 its reverse (74112721), we get a palindrome (86833868).

The spelling of 12721147 in words is "twelve million, seven hundred twenty-one thousand, one hundred forty-seven".