12721042 has 8 divisors (see below), whose sum is σ = 19187532. Its totient is φ = 6325200.

The previous prime is 12721039. The next prime is 12721043. The reversal of 12721042 is 24012721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10949481 + 1771561 = 3309^2 + 1331^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (12721043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17209 + ... + 17932.

Almost surely, 2^12721042 is an apocalyptic number.

12721042 is a deficient number, since it is larger than the sum of its proper divisors (6466490).

12721042 is a wasteful number, since it uses less digits than its factorization.

12721042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35324.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 12721042 is about 3566.6569781800. The cubic root of 12721042 is about 233.4394379111.

Adding to 12721042 its reverse (24012721), we get a palindrome (36733763).

The spelling of 12721042 in words is "twelve million, seven hundred twenty-one thousand, forty-two".