111020211110021 has 2 divisors, whose sum is σ = 111020211110022. Its totient is φ = 111020211110020.

The previous prime is 111020211109999. The next prime is 111020211110041. The reversal of 111020211110021 is 120011112020111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89559459979396 + 21460751130625 = 9463586^2 + 4632575^2 .

It is a cyclic number.

It is not a de Polignac number, because 111020211110021 - 2⁶ = 111020211109957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111020211109978 and 111020211110005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111020211110041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55510105555010 + 55510105555011.

It is an arithmetic number, because the mean of its divisors is an integer number (55510105555011).

Almost surely, 2^{111020211110021} is an apocalyptic number.

It is an amenable number.

111020211110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111020211110021 is an equidigital number, since it uses as much as digits as its factorization.

111020211110021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 111020211110021 its reverse (120011112020111), we get a palindrome (231031323130132).

The spelling of 111020211110021 in words is "one hundred eleven trillion, twenty billion, two hundred eleven million, one hundred ten thousand, twenty-one".