21110121102029 has 2 divisors, whose sum is σ = 21110121102030. Its totient is φ = 21110121102028.

The previous prime is 21110121102019. The next prime is 21110121102067. The reversal of 21110121102029 is 92020112101112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11573080097929 + 9537041004100 = 3401923^2 + 3088210^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110121102029 - 2⁴ = 21110121102013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21110121101995 and 21110121102013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21110121102019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555060551014 + 10555060551015.

It is an arithmetic number, because the mean of its divisors is an integer number (10555060551015).

Almost surely, 2^{21110121102029} is an apocalyptic number.

It is an amenable number.

21110121102029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21110121102029 is an equidigital number, since it uses as much as digits as its factorization.

21110121102029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 21110121102029 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty-one million, one hundred two thousand, twenty-nine".