12012621 has 4 divisors (see below), whose sum is σ = 16016832. Its totient is φ = 8008412.

The previous prime is 12012619. The next prime is 12012629. The reversal of 12012621 is 12621021.

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 12012621 - 2¹ = 12012619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12012621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012629) 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, 2002101 + ... + 2002106.

It is an arithmetic number, because the mean of its divisors is an integer number (4004208).

Almost surely, 2^12012621 is an apocalyptic number.

It is an amenable number.

12012621 is a deficient number, since it is larger than the sum of its proper divisors (4004211).

12012621 is an equidigital number, since it uses as much as digits as its factorization.

12012621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004210.

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

The square root of 12012621 is about 3465.9228208372. The cubic root of 12012621 is about 229.0230839350.

Adding to 12012621 its reverse (12621021), we get a palindrome (24633642).

Subtracting 12012621 from its reverse (12621021), we obtain a square (608400 = 780²).

The spelling of 12012621 in words is "twelve million, twelve thousand, six hundred twenty-one".