12345621 has 16 divisors (see below), whose sum is σ = 17694144. Its totient is φ = 7628544.

The previous prime is 12345581. The next prime is 12345623. The reversal of 12345621 is 12654321.

It is not a de Polignac number, because 12345621 - 2⁷ = 12345493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12345591 and 12345600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12345623) 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 15 ways as a sum of consecutive naturals, for example, 1611 + ... + 5223.

It is an arithmetic number, because the mean of its divisors is an integer number (1105884).

Almost surely, 2^12345621 is an apocalyptic number.

It is an amenable number.

12345621 is a deficient number, since it is larger than the sum of its proper divisors (5348523).

12345621 is a wasteful number, since it uses less digits than its factorization.

12345621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3700.

The product of its digits is 1440, while the sum is 24.

The square root of 12345621 is about 3513.6335893203. The cubic root of 12345621 is about 231.1200627714.

Adding to 12345621 its reverse (12654321), we get a palindrome (24999942).

The spelling of 12345621 in words is "twelve million, three hundred forty-five thousand, six hundred twenty-one".