111021110010021 has 4 divisors (see below), whose sum is σ = 148028146680032. Its totient is φ = 74014073340012.

The previous prime is 111021110010011. The next prime is 111021110010049. The reversal of 111021110010021 is 120010011120111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 111021110010021 - 2²⁵ = 111021076455589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111021110009979 and 111021110010006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021110010011) 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 3 ways as a sum of consecutive naturals, for example, 18503518335001 + ... + 18503518335006.

It is an arithmetic number, because the mean of its divisors is an integer number (37007036670008).

Almost surely, 2^{111021110010021} is an apocalyptic number.

It is an amenable number.

111021110010021 is a deficient number, since it is larger than the sum of its proper divisors (37007036670011).

111021110010021 is an equidigital number, since it uses as much as digits as its factorization.

111021110010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37007036670010.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 111021110010021 its reverse (120010011120111), we get a palindrome (231031121130132).

The spelling of 111021110010021 in words is "one hundred eleven trillion, twenty-one billion, one hundred ten million, ten thousand, twenty-one".