12721172 has 24 divisors (see below), whose sum is σ = 22730400. Its totient is φ = 6228576.

The previous prime is 12721171. The next prime is 12721183. The reversal of 12721172 is 27112721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70979 + ... + 71157.

It is an arithmetic number, because the mean of its divisors is an integer number (947100).

Almost surely, 2^12721172 is an apocalyptic number.

It is an amenable number.

12721172 is a deficient number, since it is larger than the sum of its proper divisors (10009228).

12721172 is a wasteful number, since it uses less digits than its factorization.

12721172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 453 counting only the distinct ones).

The product of its digits is 392, while the sum is 23.

The square root of 12721172 is about 3566.6752024820. The cubic root of 12721172 is about 233.4402331034.

Adding to 12721172 its reverse (27112721), we get a palindrome (39833893).

The spelling of 12721172 in words is "twelve million, seven hundred twenty-one thousand, one hundred seventy-two".