12321212021 has 2 divisors, whose sum is σ = 12321212022. Its totient is φ = 12321212020.

The previous prime is 12321212003. The next prime is 12321212039. The reversal of 12321212021 is 12021212321.

It is a balanced prime because it is at equal distance from previous prime (12321212003) and next prime (12321212039).

It can be written as a sum of positive squares in only one way, i.e., 10177984996 + 2143227025 = 100886^2 + 46295^2 .

It is a cyclic number.

It is not a de Polignac number, because 12321212021 - 2⁶ = 12321211957 is a prime.

It is a super-3 number, since 3×12321212021³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12321212051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6160606010 + 6160606011.

It is an arithmetic number, because the mean of its divisors is an integer number (6160606011).

Almost surely, 2^12321212021 is an apocalyptic number.

It is an amenable number.

12321212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12321212021 is an equidigital number, since it uses as much as digits as its factorization.

12321212021 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 17.

Adding to 12321212021 its reverse (12021212321), we get a palindrome (24342424342).

The spelling of 12321212021 in words is "twelve billion, three hundred twenty-one million, two hundred twelve thousand, twenty-one".