12102403021 has 2 divisors, whose sum is σ = 12102403022. Its totient is φ = 12102403020.

The previous prime is 12102402997. The next prime is 12102403057. The reversal of 12102403021 is 12030420121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9086855625 + 3015547396 = 95325^2 + 54914^2 .

It is a cyclic number.

It is not a de Polignac number, because 12102403021 - 2²¹ = 12100305869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12102402986 and 12102403004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12102403081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6051201510 + 6051201511.

It is an arithmetic number, because the mean of its divisors is an integer number (6051201511).

Almost surely, 2^12102403021 is an apocalyptic number.

It is an amenable number.

12102403021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12102403021 is an equidigital number, since it uses as much as digits as its factorization.

12102403021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 12102403021 its reverse (12030420121), we get a palindrome (24132823142).

The spelling of 12102403021 in words is "twelve billion, one hundred two million, four hundred three thousand, twenty-one".