111031220321021 has 32 divisors (see below), whose sum is σ = 149352441966336. Its totient is φ = 79714995264000.

The previous prime is 111031220320973. The next prime is 111031220321093. The reversal of 111031220321021 is 120123022130111.

It is a cyclic number.

It is not a de Polignac number, because 111031220321021 - 2¹⁸ = 111031220058877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111031220320984 and 111031220321002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111031220323021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101972600 + ... + 103055681.

It is an arithmetic number, because the mean of its divisors is an integer number (4667263811448).

Almost surely, 2^{111031220321021} is an apocalyptic number.

111031220321021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111031220321021 is a deficient number, since it is larger than the sum of its proper divisors (38321221645315).

111031220321021 is a wasteful number, since it uses less digits than its factorization.

111031220321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205028853.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 111031220321021 its reverse (120123022130111), we get a palindrome (231154242451132).

The spelling of 111031220321021 in words is "one hundred eleven trillion, thirty-one billion, two hundred twenty million, three hundred twenty-one thousand, twenty-one".