221211118123969 has 2 divisors, whose sum is σ = 221211118123970. Its totient is φ = 221211118123968.

The previous prime is 221211118123927. The next prime is 221211118123973. The reversal of 221211118123969 is 969321811112122.

It is a happy number.

221211118123969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197984260793344 + 23226857330625 = 14070688^2 + 4819425^2 .

It is a cyclic number.

It is not a de Polignac number, because 221211118123969 - 2⁴⁷ = 80473629768641 is a prime.

It is a super-2 number, since 2×221211118123969² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221211118120969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605559061984 + 110605559061985.

It is an arithmetic number, because the mean of its divisors is an integer number (110605559061985).

Almost surely, 2^{221211118123969} is an apocalyptic number.

It is an amenable number.

221211118123969 is a deficient number, since it is larger than the sum of its proper divisors (1).

221211118123969 is an equidigital number, since it uses as much as digits as its factorization.

221211118123969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 49.

The spelling of 221211118123969 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred eighteen million, one hundred twenty-three thousand, nine hundred sixty-nine".