12021321121 has 2 divisors, whose sum is σ = 12021321122. Its totient is φ = 12021321120.

The previous prime is 12021321119. The next prime is 12021321131. The reversal of 12021321121 is 12112312021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11164880896 + 856440225 = 105664^2 + 29265^2 .

It is an emirp because it is prime and its reverse (12112312021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12021321121 - 2¹ = 12021321119 is a prime.

It is a super-2 number, since 2×12021321121² (a number of 21 digits) contains 22 as substring.

Together with 12021321119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 12021321095 and 12021321104.

It is not a weakly prime, because it can be changed into another prime (12021321131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010660560 + 6010660561.

It is an arithmetic number, because the mean of its divisors is an integer number (6010660561).

Almost surely, 2^12021321121 is an apocalyptic number.

It is an amenable number.

12021321121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021321121 is an equidigital number, since it uses as much as digits as its factorization.

12021321121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12021321121 its reverse (12112312021), we get a palindrome (24133633142).

The spelling of 12021321121 in words is "twelve billion, twenty-one million, three hundred twenty-one thousand, one hundred twenty-one".