12103100021 has 2 divisors, whose sum is σ = 12103100022. Its totient is φ = 12103100020.

The previous prime is 12103100017. The next prime is 12103100027. The reversal of 12103100021 is 12000130121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8301760996 + 3801339025 = 91114^2 + 61655^2 .

It is a cyclic number.

It is not a de Polignac number, because 12103100021 - 2² = 12103100017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12103099975 and 12103100011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12103100027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6051550010 + 6051550011.

It is an arithmetic number, because the mean of its divisors is an integer number (6051550011).

Almost surely, 2^12103100021 is an apocalyptic number.

It is an amenable number.

12103100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12103100021 is an equidigital number, since it uses as much as digits as its factorization.

12103100021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 12103100021 its reverse (12000130121), we get a palindrome (24103230142).

The spelling of 12103100021 in words is "twelve billion, one hundred three million, one hundred thousand, twenty-one".