12120621 has 4 divisors (see below), whose sum is σ = 16160832. Its totient is φ = 8080412.

The previous prime is 12120611. The next prime is 12120629. The reversal of 12120621 is 12602121.

12120621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12120621 - 2¹⁴ = 12104237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12120621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2020101 + ... + 2020106.

It is an arithmetic number, because the mean of its divisors is an integer number (4040208).

Almost surely, 2^12120621 is an apocalyptic number.

It is an amenable number.

12120621 is a deficient number, since it is larger than the sum of its proper divisors (4040211).

12120621 is an equidigital number, since it uses as much as digits as its factorization.

12120621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040210.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 12120621 is about 3481.4682247581. The cubic root of 12120621 is about 229.7073846545.

Adding to 12120621 its reverse (12602121), we get a palindrome (24722742).

The spelling of 12120621 in words is "twelve million, one hundred twenty thousand, six hundred twenty-one".