111221222111869 has 2 divisors, whose sum is σ = 111221222111870. Its totient is φ = 111221222111868.

The previous prime is 111221222111833. The next prime is 111221222112059. The reversal of 111221222111869 is 968111222122111.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111212421232900 + 8800878969 = 10545730^2 + 93813^2 .

It is an emirp because it is prime and its reverse (968111222122111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111221222111869 - 2³⁵ = 111186862373501 is a prime.

It is a super-2 number, since 2×111221222111869² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111221226111869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610611055934 + 55610611055935.

It is an arithmetic number, because the mean of its divisors is an integer number (55610611055935).

Almost surely, 2^{111221222111869} is an apocalyptic number.

It is an amenable number.

111221222111869 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221222111869 is an equidigital number, since it uses as much as digits as its factorization.

111221222111869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 40.

The spelling of 111221222111869 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred eleven thousand, eight hundred sixty-nine".