111011112010021 has 2 divisors, whose sum is σ = 111011112010022. Its totient is φ = 111011112010020.

The previous prime is 111011112009979. The next prime is 111011112010027. The reversal of 111011112010021 is 120010211110111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110272870185921 + 738241824100 = 10501089^2 + 859210^2 .

It is a cyclic number.

It is not a de Polignac number, because 111011112010021 - 2¹¹ = 111011112007973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111011112009983 and 111011112010010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111011112010027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505556005010 + 55505556005011.

It is an arithmetic number, because the mean of its divisors is an integer number (55505556005011).

Almost surely, 2^{111011112010021} is an apocalyptic number.

It is an amenable number.

111011112010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111011112010021 is an equidigital number, since it uses as much as digits as its factorization.

111011112010021 is an evil number, because the sum of its binary digits is even.

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

Adding to 111011112010021 its reverse (120010211110111), we get a palindrome (231021323120132).

The spelling of 111011112010021 in words is "one hundred eleven trillion, eleven billion, one hundred twelve million, ten thousand, twenty-one".