12110221261 has 2 divisors, whose sum is σ = 12110221262. Its totient is φ = 12110221260.

The previous prime is 12110221259. The next prime is 12110221283. The reversal of 12110221261 is 16212201121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12016325161 + 93896100 = 109619^2 + 9690^2 .

It is a cyclic number.

It is not a de Polignac number, because 12110221261 - 2¹ = 12110221259 is a prime.

It is a super-3 number, since 3×12110221261³ (a number of 31 digits) contains 333 as substring.

Together with 12110221259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12110221561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055110630 + 6055110631.

It is an arithmetic number, because the mean of its divisors is an integer number (6055110631).

Almost surely, 2^12110221261 is an apocalyptic number.

It is an amenable number.

12110221261 is a deficient number, since it is larger than the sum of its proper divisors (1).

12110221261 is an equidigital number, since it uses as much as digits as its factorization.

12110221261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 12110221261 its reverse (16212201121), we get a palindrome (28322422382).

The spelling of 12110221261 in words is "twelve billion, one hundred ten million, two hundred twenty-one thousand, two hundred sixty-one".