12721107 has 16 divisors (see below), whose sum is σ = 19443200. Its totient is φ = 7247232.

The previous prime is 12721103. The next prime is 12721147. The reversal of 12721107 is 70112721.

It is a happy number.

12721107 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12721107 - 2² = 12721103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

12721107 is strictly pandigital in base 8.

It is not an unprimeable number, because it can be changed into a prime (12721103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8394 + ... + 9792.

It is an arithmetic number, because the mean of its divisors is an integer number (1215200).

Almost surely, 2^12721107 is an apocalyptic number.

12721107 is a deficient number, since it is larger than the sum of its proper divisors (6722093).

12721107 is a wasteful number, since it uses less digits than its factorization.

12721107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1842.

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

The square root of 12721107 is about 3566.6660903426. Note that the first 3 decimals coincide. The cubic root of 12721107 is about 233.4398355080.

Adding to 12721107 its reverse (70112721), we get a palindrome (82833828).

The spelling of 12721107 in words is "twelve million, seven hundred twenty-one thousand, one hundred seven".