21112110011021 has 2 divisors, whose sum is σ = 21112110011022. Its totient is φ = 21112110011020.

The previous prime is 21112110010993. The next prime is 21112110011039. The reversal of 21112110011021 is 12011001121112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16516827528100 + 4595282482921 = 4064090^2 + 2143661^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112110011021 - 2³⁴ = 21094930141837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112110010987 and 21112110011005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112110011221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556055005510 + 10556055005511.

It is an arithmetic number, because the mean of its divisors is an integer number (10556055005511).

Almost surely, 2^{21112110011021} is an apocalyptic number.

It is an amenable number.

21112110011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112110011021 is an equidigital number, since it uses as much as digits as its factorization.

21112110011021 is an evil number, because the sum of its binary digits is even.

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

Adding to 21112110011021 its reverse (12011001121112), we get a palindrome (33123111132133).

The spelling of 21112110011021 in words is "twenty-one trillion, one hundred twelve billion, one hundred ten million, eleven thousand, twenty-one".