111312111021 has 64 divisors (see below), whose sum is σ = 163555891200. Its totient is φ = 67091141376.

The previous prime is 111312111019. The next prime is 111312111041. The reversal of 111312111021 is 120111213111.

It is not a de Polignac number, because 111312111021 - 2¹ = 111312111019 is a prime.

It is a super-5 number, since 5×111312111021⁵ (a number of 56 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111312111041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23240895 + ... + 23245683.

It is an arithmetic number, because the mean of its divisors is an integer number (2555560800).

Almost surely, 2^111312111021 is an apocalyptic number.

It is an amenable number.

111312111021 is a deficient number, since it is larger than the sum of its proper divisors (52243780179).

111312111021 is a wasteful number, since it uses less digits than its factorization.

111312111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5058.

The product of its (nonzero) digits is 12, while the sum is 15.

Adding to 111312111021 its reverse (120111213111), we get a palindrome (231423324132).

The spelling of 111312111021 in words is "one hundred eleven billion, three hundred twelve million, one hundred eleven thousand, twenty-one".