12125621 has 4 divisors (see below), whose sum is σ = 12331200. Its totient is φ = 11920044.

The previous prime is 12125609. The next prime is 12125647. The reversal of 12125621 is 12652121.

12125621 is digitally balanced in base 2, 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, and also an emirpimes, since its reverse is a distinct semiprime: 12652121 = 127 ⋅99623.

It is a cyclic number.

It is not a de Polignac number, because 12125621 - 2¹⁸ = 11863477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12125593 and 12125602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12125651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102701 + ... + 102818.

It is an arithmetic number, because the mean of its divisors is an integer number (3082800).

Almost surely, 2^12125621 is an apocalyptic number.

It is an amenable number.

12125621 is a deficient number, since it is larger than the sum of its proper divisors (205579).

12125621 is an equidigital number, since it uses as much as digits as its factorization.

12125621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205578.

The product of its digits is 240, while the sum is 20.

The square root of 12125621 is about 3482.1862385576. The cubic root of 12125621 is about 229.7389666180.

Adding to 12125621 its reverse (12652121), we get a palindrome (24777742).

The spelling of 12125621 in words is "twelve million, one hundred twenty-five thousand, six hundred twenty-one".