12077721 has 8 divisors (see below), whose sum is σ = 17892960. Its totient is φ = 8051796.

The previous prime is 12077707. The next prime is 12077729. The reversal of 12077721 is 12777021.

It is not a de Polignac number, because 12077721 - 2⁹ = 12077209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 447323 = 12077721 / (1 + 2 + 0 + 7 + 7 + 7 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (12077729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223635 + ... + 223688.

It is an arithmetic number, because the mean of its divisors is an integer number (2236620).

Almost surely, 2^12077721 is an apocalyptic number.

It is an amenable number.

12077721 is a deficient number, since it is larger than the sum of its proper divisors (5815239).

12077721 is an equidigital number, since it uses as much as digits as its factorization.

12077721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447332 (or 447326 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 27.

The square root of 12077721 is about 3475.3015696483. The cubic root of 12077721 is about 229.4360537805.

It can be divided in two parts, 120 and 77721, that added together give a square (77841 = 279²).

The spelling of 12077721 in words is "twelve million, seventy-seven thousand, seven hundred twenty-one".