12012211021 has 2 divisors, whose sum is σ = 12012211022. Its totient is φ = 12012211020.

The previous prime is 12012211009. The next prime is 12012211031. The reversal of 12012211021 is 12011221021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11158753225 + 853457796 = 105635^2 + 29214^2 .

It is a cyclic number.

It is not a de Polignac number, because 12012211021 - 2¹⁵ = 12012178253 is a prime.

It is a super-2 number, since 2×12012211021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12012210992 and 12012211010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12012211031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006105510 + 6006105511.

It is an arithmetic number, because the mean of its divisors is an integer number (6006105511).

Almost surely, 2^12012211021 is an apocalyptic number.

It is an amenable number.

12012211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012211021 is an equidigital number, since it uses as much as digits as its factorization.

12012211021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12012211021 its reverse (12011221021), we get a palindrome (24023432042).

The spelling of 12012211021 in words is "twelve billion, twelve million, two hundred eleven thousand, twenty-one".