12721242 has 8 divisors (see below), whose sum is σ = 25442496. Its totient is φ = 4240412.

The previous prime is 12721217. The next prime is 12721271. The reversal of 12721242 is 24212721.

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

12721242 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060098 + ... + 1060109.

It is an arithmetic number, because the mean of its divisors is an integer number (3180312).

Almost surely, 2^12721242 is an apocalyptic number.

12721242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12721242 is a wasteful number, since it uses less digits than its factorization.

12721242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120212.

The product of its digits is 448, while the sum is 21.

The square root of 12721242 is about 3566.6850155291. The cubic root of 12721242 is about 233.4406612816.

Adding to 12721242 its reverse (24212721), we get a palindrome (36933963).

The spelling of 12721242 in words is "twelve million, seven hundred twenty-one thousand, two hundred forty-two".