12942721 has 8 divisors (see below), whose sum is σ = 14733504. Its totient is φ = 11254320.

The previous prime is 12942701. The next prime is 12942737. The reversal of 12942721 is 12724921.

12942721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12942721 - 2¹⁹ = 12418433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12942721.

It is not an unprimeable number, because it can be changed into a prime (12942701) 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, 25326 + ... + 25831.

It is an arithmetic number, because the mean of its divisors is an integer number (1841688).

Almost surely, 2^12942721 is an apocalyptic number.

12942721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12942721 is a deficient number, since it is larger than the sum of its proper divisors (1790783).

12942721 is a wasteful number, since it uses less digits than its factorization.

12942721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51191.

The product of its digits is 2016, while the sum is 28.

The square root of 12942721 is about 3597.5993384478. The cubic root of 12942721 is about 234.7876216137.

The spelling of 12942721 in words is "twelve million, nine hundred forty-two thousand, seven hundred twenty-one".