111231321021 has 6 divisors (see below), whose sum is σ = 160667463710. Its totient is φ = 74154214008.

The previous prime is 111231320989. The next prime is 111231321023. The reversal of 111231321021 is 120123132111.

111231321021 is a `hidden beast` number, since 111 + 231 + 321 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 108287064900 + 2944256121 = 329070^2 + 54261^2 .

It is not a de Polignac number, because 111231321021 - 2⁵ = 111231320989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111231320985 and 111231321003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111231321023) 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 5 ways as a sum of consecutive naturals, for example, 6179517826 + ... + 6179517843.

Almost surely, 2^111231321021 is an apocalyptic number.

It is an amenable number.

111231321021 is a deficient number, since it is larger than the sum of its proper divisors (49436142689).

111231321021 is a wasteful number, since it uses less digits than its factorization.

111231321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12359035675 (or 12359035672 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 111231321021 its reverse (120123132111), we get a palindrome (231354453132).

The spelling of 111231321021 in words is "one hundred eleven billion, two hundred thirty-one million, three hundred twenty-one thousand, twenty-one".