12210403021 has 2 divisors, whose sum is σ = 12210403022. Its totient is φ = 12210403020.

The previous prime is 12210403019. The next prime is 12210403027. The reversal of 12210403021 is 12030401221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11590890921 + 619512100 = 107661^2 + 24890^2 .

It is an emirp because it is prime and its reverse (12030401221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12210403021 - 2¹ = 12210403019 is a prime.

Together with 12210403019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12210402986 and 12210403004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12210403027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105201510 + 6105201511.

It is an arithmetic number, because the mean of its divisors is an integer number (6105201511).

Almost surely, 2^12210403021 is an apocalyptic number.

It is an amenable number.

12210403021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12210403021 is an equidigital number, since it uses as much as digits as its factorization.

12210403021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 12210403021 its reverse (12030401221), we get a palindrome (24240804242).

The spelling of 12210403021 in words is "twelve billion, two hundred ten million, four hundred three thousand, twenty-one".