12220121200181 has 2 divisors, whose sum is σ = 12220121200182. Its totient is φ = 12220121200180.

The previous prime is 12220121200087. The next prime is 12220121200193. The reversal of 12220121200181 is 18100212102221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8162277580900 + 4057843619281 = 2856970^2 + 2014409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12220121200181 is a prime.

It is a super-2 number, since 2×12220121200181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12220121200681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110060600090 + 6110060600091.

It is an arithmetic number, because the mean of its divisors is an integer number (6110060600091).

Almost surely, 2^{12220121200181} is an apocalyptic number.

It is an amenable number.

12220121200181 is a deficient number, since it is larger than the sum of its proper divisors (1).

12220121200181 is an equidigital number, since it uses as much as digits as its factorization.

12220121200181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 23.

The spelling of 12220121200181 in words is "twelve trillion, two hundred twenty billion, one hundred twenty-one million, two hundred thousand, one hundred eighty-one".