12721071 has 16 divisors (see below), whose sum is σ = 18569088. Its totient is φ = 7682400.

The previous prime is 12721043. The next prime is 12721087. The reversal of 12721071 is 17012721.

It is a happy number.

It is not a de Polignac number, because 12721071 - 2⁵ = 12721039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12616 + ... + 13586.

It is an arithmetic number, because the mean of its divisors is an integer number (1160568).

Almost surely, 2^12721071 is an apocalyptic number.

12721071 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12721071 is a deficient number, since it is larger than the sum of its proper divisors (5848017).

12721071 is a wasteful number, since it uses less digits than its factorization.

12721071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382.

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 12721071 is about 3566.6610436093. The cubic root of 12721071 is about 233.4396153007.

Adding to 12721071 its reverse (17012721), we get a palindrome (29733792).

The spelling of 12721071 in words is "twelve million, seven hundred twenty-one thousand, seventy-one".