111021010020021 has 4 divisors (see below), whose sum is σ = 148028013360032. Its totient is φ = 74014006680012.

The previous prime is 111021010020007. The next prime is 111021010020031. The reversal of 111021010020021 is 120020010120111.

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 111021010020021 - 2⁶ = 111021010019957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111021010019979 and 111021010020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021010020031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18503501670001 + ... + 18503501670006.

It is an arithmetic number, because the mean of its divisors is an integer number (37007003340008).

Almost surely, 2^{111021010020021} is an apocalyptic number.

It is an amenable number.

111021010020021 is a deficient number, since it is larger than the sum of its proper divisors (37007003340011).

111021010020021 is an equidigital number, since it uses as much as digits as its factorization.

111021010020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37007003340010.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111021010020021 its reverse (120020010120111), we get a palindrome (231041020140132).

The spelling of 111021010020021 in words is "one hundred eleven trillion, twenty-one billion, ten million, twenty thousand, twenty-one".