12111220061 has 2 divisors, whose sum is σ = 12111220062. Its totient is φ = 12111220060.

The previous prime is 12111220007. The next prime is 12111220063. The reversal of 12111220061 is 16002211121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9140316025 + 2970904036 = 95605^2 + 54506^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111220061 is a prime.

Together with 12111220063, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111220063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055610030 + 6055610031.

It is an arithmetic number, because the mean of its divisors is an integer number (6055610031).

Almost surely, 2^12111220061 is an apocalyptic number.

It is an amenable number.

12111220061 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111220061 is an equidigital number, since it uses as much as digits as its factorization.

12111220061 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 17.

Adding to 12111220061 its reverse (16002211121), we get a palindrome (28113431182).

The spelling of 12111220061 in words is "twelve billion, one hundred eleven million, two hundred twenty thousand, sixty-one".