12421112021 has 2 divisors, whose sum is σ = 12421112022. Its totient is φ = 12421112020.

The previous prime is 12421112017. The next prime is 12421112051. The reversal of 12421112021 is 12021112421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10771533796 + 1649578225 = 103786^2 + 40615^2 .

It is an emirp because it is prime and its reverse (12021112421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12421112021 - 2² = 12421112017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12421112051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210556010 + 6210556011.

It is an arithmetic number, because the mean of its divisors is an integer number (6210556011).

Almost surely, 2^12421112021 is an apocalyptic number.

It is an amenable number.

12421112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12421112021 is an equidigital number, since it uses as much as digits as its factorization.

12421112021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12421112021 its reverse (12021112421), we get a palindrome (24442224442).

The spelling of 12421112021 in words is "twelve billion, four hundred twenty-one million, one hundred twelve thousand, twenty-one".