12103721 has 4 divisors (see below), whose sum is σ = 13832832. Its totient is φ = 10374612.

The previous prime is 12103709. The next prime is 12103747. The reversal of 12103721 is 12730121.

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 12103721 - 2⁶ = 12103657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12103721.

It is not an unprimeable number, because it can be changed into a prime (12103781) 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, 864545 + ... + 864558.

It is an arithmetic number, because the mean of its divisors is an integer number (3458208).

Almost surely, 2^12103721 is an apocalyptic number.

It is an amenable number.

12103721 is a deficient number, since it is larger than the sum of its proper divisors (1729111).

12103721 is an equidigital number, since it uses as much as digits as its factorization.

12103721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1729110.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 12103721 is about 3479.0402412160. The cubic root of 12103721 is about 229.6005732826.

Adding to 12103721 its reverse (12730121), we get a palindrome (24833842).

The spelling of 12103721 in words is "twelve million, one hundred three thousand, seven hundred twenty-one".