12001211021 has 2 divisors, whose sum is σ = 12001211022. Its totient is φ = 12001211020.

The previous prime is 12001210999. The next prime is 12001211059. The reversal of 12001211021 is 12011210021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11708322025 + 292888996 = 108205^2 + 17114^2 .

It is a cyclic number.

It is not a de Polignac number, because 12001211021 - 2³⁰ = 10927469197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12001210993 and 12001211011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12001211821) 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, 6000605510 + 6000605511.

It is an arithmetic number, because the mean of its divisors is an integer number (6000605511).

Almost surely, 2^12001211021 is an apocalyptic number.

It is an amenable number.

12001211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12001211021 is an equidigital number, since it uses as much as digits as its factorization.

12001211021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12001211021 its reverse (12011210021), we get a palindrome (24012421042).

The spelling of 12001211021 in words is "twelve billion, one million, two hundred eleven thousand, twenty-one".