12210031021 has 2 divisors, whose sum is σ = 12210031022. Its totient is φ = 12210031020.

The previous prime is 12210031007. The next prime is 12210031051. The reversal of 12210031021 is 12013001221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12208040100 + 1990921 = 110490^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 12210031021 - 2⁷ = 12210030893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12210030992 and 12210031010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12210031051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105015510 + 6105015511.

It is an arithmetic number, because the mean of its divisors is an integer number (6105015511).

Almost surely, 2^12210031021 is an apocalyptic number.

It is an amenable number.

12210031021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12210031021 is an equidigital number, since it uses as much as digits as its factorization.

12210031021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 12210031021 its reverse (12013001221), we get a palindrome (24223032242).

The spelling of 12210031021 in words is "twelve billion, two hundred ten million, thirty-one thousand, twenty-one".