12182721 has 16 divisors (see below), whose sum is σ = 16946688. Its totient is φ = 7776000.

The previous prime is 12182719. The next prime is 12182749. The reversal of 12182721 is 12728121.

12182721 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12182721 - 2¹ = 12182719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12182691 and 12182700.

It is not an unprimeable number, because it can be changed into a prime (12182701) 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, 8745 + ... + 10041.

It is an arithmetic number, because the mean of its divisors is an integer number (1059168).

Almost surely, 2^12182721 is an apocalyptic number.

It is an amenable number.

12182721 is a deficient number, since it is larger than the sum of its proper divisors (4763967).

12182721 is a wasteful number, since it uses less digits than its factorization.

12182721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432.

The product of its digits is 448, while the sum is 24.

The square root of 12182721 is about 3490.3754812341. The cubic root of 12182721 is about 230.0990184865.

The spelling of 12182721 in words is "twelve million, one hundred eighty-two thousand, seven hundred twenty-one".