111221312129 has 4 divisors (see below), whose sum is σ = 116057021376. Its totient is φ = 106385602884.

The previous prime is 111221312077. The next prime is 111221312141. The reversal of 111221312129 is 921213122111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111221312129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111221312098 and 111221312107.

It is not an unprimeable number, because it can be changed into a prime (111221312929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2417854589 + ... + 2417854634.

It is an arithmetic number, because the mean of its divisors is an integer number (29014255344).

Almost surely, 2^111221312129 is an apocalyptic number.

It is an amenable number.

111221312129 is a deficient number, since it is larger than the sum of its proper divisors (4835709247).

111221312129 is an equidigital number, since it uses as much as digits as its factorization.

111221312129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4835709246.

The product of its digits is 432, while the sum is 26.

The spelling of 111221312129 in words is "one hundred eleven billion, two hundred twenty-one million, three hundred twelve thousand, one hundred twenty-nine".