111221220169439 has 2 divisors, whose sum is σ = 111221220169440. Its totient is φ = 111221220169438.

The previous prime is 111221220169421. The next prime is 111221220169441. The reversal of 111221220169439 is 934961022122111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111221220169439 - 2²⁰ = 111221219120863 is a prime.

Together with 111221220169441, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111221220169439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111221220169489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610610084719 + 55610610084720.

It is an arithmetic number, because the mean of its divisors is an integer number (55610610084720).

Almost surely, 2^{111221220169439} is an apocalyptic number.

111221220169439 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221220169439 is an equidigital number, since it uses as much as digits as its factorization.

111221220169439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 111221220169439 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred twenty million, one hundred sixty-nine thousand, four hundred thirty-nine".