12100221061 has 2 divisors, whose sum is σ = 12100221062. Its totient is φ = 12100221060.

The previous prime is 12100221047. The next prime is 12100221073. The reversal of 12100221061 is 16012200121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11070196225 + 1030024836 = 105215^2 + 32094^2 .

It is a cyclic number.

It is not a de Polignac number, because 12100221061 - 2⁷ = 12100220933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12100225061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6050110530 + 6050110531.

It is an arithmetic number, because the mean of its divisors is an integer number (6050110531).

Almost surely, 2^12100221061 is an apocalyptic number.

It is an amenable number.

12100221061 is a deficient number, since it is larger than the sum of its proper divisors (1).

12100221061 is an equidigital number, since it uses as much as digits as its factorization.

12100221061 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 12100221061 its reverse (16012200121), we get a palindrome (28112421182).

The spelling of 12100221061 in words is "twelve billion, one hundred million, two hundred twenty-one thousand, sixty-one".