111220323123 has 64 divisors (see below), whose sum is σ = 197314288640. Its totient is φ = 54075796992.

The previous prime is 111220323113. The next prime is 111220323209. The reversal of 111220323123 is 321323022111.

It is not a de Polignac number, because 111220323123 - 2²¹ = 111218225971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 111220323123.

It is not an unprimeable number, because it can be changed into a prime (111220323113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 97840 + ... + 481677.

It is an arithmetic number, because the mean of its divisors is an integer number (3083035760).

Almost surely, 2^111220323123 is an apocalyptic number.

111220323123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

111220323123 is a deficient number, since it is larger than the sum of its proper divisors (86093965517).

111220323123 is a wasteful number, since it uses less digits than its factorization.

111220323123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579596.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 111220323123 its reverse (321323022111), we get a palindrome (432543345234).

The spelling of 111220323123 in words is "one hundred eleven billion, two hundred twenty million, three hundred twenty-three thousand, one hundred twenty-three".