111123021031 has 16 divisors (see below), whose sum is σ = 127748233728. Its totient is φ = 95671972000.

The previous prime is 111123021017. The next prime is 111123021047. The reversal of 111123021031 is 130120321111.

It is a happy number.

It is not a de Polignac number, because 111123021031 - 2⁵ = 111123020999 is a prime.

It is a super-2 number, since 2×111123021031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111123020996 and 111123021014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111123021091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2148811 + ... + 2199916.

It is an arithmetic number, because the mean of its divisors is an integer number (7984264608).

Almost surely, 2^111123021031 is an apocalyptic number.

111123021031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111123021031 is a deficient number, since it is larger than the sum of its proper divisors (16625212697).

111123021031 is a wasteful number, since it uses less digits than its factorization.

111123021031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4348862.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 111123021031 its reverse (130120321111), we get a palindrome (241243342142).

The spelling of 111123021031 in words is "one hundred eleven billion, one hundred twenty-three million, twenty-one thousand, thirty-one".