12120211021 has 2 divisors, whose sum is σ = 12120211022. Its totient is φ = 12120211020.

The previous prime is 12120210997. The next prime is 12120211043. The reversal of 12120211021 is 12011202121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10094220900 + 2025990121 = 100470^2 + 45011^2 .

It is a cyclic number.

It is not a de Polignac number, because 12120211021 - 2¹⁷ = 12120079949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12120210992 and 12120211010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12120211121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060105510 + 6060105511.

It is an arithmetic number, because the mean of its divisors is an integer number (6060105511).

Almost surely, 2^12120211021 is an apocalyptic number.

It is an amenable number.

12120211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12120211021 is an equidigital number, since it uses as much as digits as its factorization.

12120211021 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 12120211021 its reverse (12011202121), we get a palindrome (24131413142).

The spelling of 12120211021 in words is "twelve billion, one hundred twenty million, two hundred eleven thousand, twenty-one".