111111102010021 has 4 divisors (see below), whose sum is σ = 112994341027200. Its totient is φ = 109227862992844.

The previous prime is 111111102009997. The next prime is 111111102010057. The reversal of 111111102010021 is 120010201111111.

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 a cyclic number.

It is not a de Polignac number, because 111111102010021 - 2¹¹ = 111111102007973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111111102009983 and 111111102010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111102010061) 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, 941619508501 + ... + 941619508618.

It is an arithmetic number, because the mean of its divisors is an integer number (28248585256800).

Almost surely, 2^{111111102010021} is an apocalyptic number.

It is an amenable number.

111111102010021 is a deficient number, since it is larger than the sum of its proper divisors (1883239017179).

111111102010021 is an equidigital number, since it uses as much as digits as its factorization.

111111102010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883239017178.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 111111102010021 its reverse (120010201111111), we get a palindrome (231121303121132).

The spelling of 111111102010021 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred two million, ten thousand, twenty-one".