12103643021 has 8 divisors (see below), whose sum is σ = 12245686200. Its totient is φ = 11961734400.

The previous prime is 12103643011. The next prime is 12103643023. The reversal of 12103643021 is 12034630121.

It can be written as a sum of positive squares in 4 ways, for example, as 4258998121 + 7844644900 = 65261^2 + 88570^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12103643021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12103643023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153371 + ... + 218471.

It is an arithmetic number, because the mean of its divisors is an integer number (1530710775).

Almost surely, 2^12103643021 is an apocalyptic number.

It is an amenable number.

12103643021 is a deficient number, since it is larger than the sum of its proper divisors (142043179).

12103643021 is an equidigital number, since it uses as much as digits as its factorization.

12103643021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67279.

The product of its (nonzero) digits is 864, while the sum is 23.

The spelling of 12103643021 in words is "twelve billion, one hundred three million, six hundred forty-three thousand, twenty-one".