221220111121069 has 2 divisors, whose sum is σ = 221220111121070. Its totient is φ = 221220111121068.

The previous prime is 221220111121039. The next prime is 221220111121151. The reversal of 221220111121069 is 960121111022122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175833885296169 + 45386225824900 = 13260237^2 + 6736930^2 .

It is a cyclic number.

It is not a de Polignac number, because 221220111121069 - 2⁴⁵ = 186035739032237 is a prime.

It is a super-2 number, since 2×221220111121069² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221220111121069.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221220111121039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610055560534 + 110610055560535.

It is an arithmetic number, because the mean of its divisors is an integer number (110610055560535).

Almost surely, 2^{221220111121069} is an apocalyptic number.

It is an amenable number.

221220111121069 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220111121069 is an equidigital number, since it uses as much as digits as its factorization.

221220111121069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 31.

The spelling of 221220111121069 in words is "two hundred twenty-one trillion, two hundred twenty billion, one hundred eleven million, one hundred twenty-one thousand, sixty-nine".