12361621 has 4 divisors (see below), whose sum is σ = 12571200. Its totient is φ = 12152044.

The previous prime is 12361619. The next prime is 12361651. The reversal of 12361621 is 12616321.

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: 12616321 = 433 ⋅29137.

It is a cyclic number.

It is not a de Polignac number, because 12361621 - 2¹ = 12361619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12361592 and 12361601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12361651) 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, 104701 + ... + 104818.

It is an arithmetic number, because the mean of its divisors is an integer number (3142800).

Almost surely, 2^12361621 is an apocalyptic number.

It is an amenable number.

12361621 is a deficient number, since it is larger than the sum of its proper divisors (209579).

12361621 is an equidigital number, since it uses as much as digits as its factorization.

12361621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209578.

The product of its digits is 432, while the sum is 22.

The square root of 12361621 is about 3515.9096973614. The cubic root of 12361621 is about 231.2198640057.

Adding to 12361621 its reverse (12616321), we get a palindrome (24977942).

The spelling of 12361621 in words is "twelve million, three hundred sixty-one thousand, six hundred twenty-one".