111000010021 has 2 divisors, whose sum is σ = 111000010022. Its totient is φ = 111000010020.

The previous prime is 111000010013. The next prime is 111000010031. The reversal of 111000010021 is 120010000111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102296985921 + 8703024100 = 319839^2 + 93290^2 .

It is a cyclic number.

It is not a de Polignac number, because 111000010021 - 2³ = 111000010013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111000009986 and 111000010013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111000010031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55500005010 + 55500005011.

It is an arithmetic number, because the mean of its divisors is an integer number (55500005011).

Almost surely, 2^111000010021 is an apocalyptic number.

It is an amenable number.

111000010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111000010021 is an equidigital number, since it uses as much as digits as its factorization.

111000010021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 111000010021 its reverse (120010000111), we get a palindrome (231010010132).

The spelling of 111000010021 in words is "one hundred eleven billion, ten thousand, twenty-one".