12021211117 has 2 divisors, whose sum is σ = 12021211118. Its totient is φ = 12021211116.

The previous prime is 12021210983. The next prime is 12021211121. The reversal of 12021211117 is 71111212021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11259119881 + 762091236 = 106109^2 + 27606^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021211117 - 2¹¹ = 12021209069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12021211094 and 12021211103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12021211177) 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, 6010605558 + 6010605559.

It is an arithmetic number, because the mean of its divisors is an integer number (6010605559).

Almost surely, 2^12021211117 is an apocalyptic number.

It is an amenable number.

12021211117 is a deficient number, since it is larger than the sum of its proper divisors (1).

12021211117 is an equidigital number, since it uses as much as digits as its factorization.

12021211117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 12021211117 its reverse (71111212021), we get a palindrome (83132423138).

The spelling of 12021211117 in words is "twelve billion, twenty-one million, two hundred eleven thousand, one hundred seventeen".