21101102021071 has 2 divisors, whose sum is σ = 21101102021072. Its totient is φ = 21101102021070.

The previous prime is 21101102021039. The next prime is 21101102021173. The reversal of 21101102021071 is 17012020110112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101102021071 - 2⁵ = 21101102021039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101102024071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550551010535 + 10550551010536.

It is an arithmetic number, because the mean of its divisors is an integer number (10550551010536).

Almost surely, 2^{21101102021071} is an apocalyptic number.

21101102021071 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101102021071 is an equidigital number, since it uses as much as digits as its factorization.

21101102021071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 19.

Adding to 21101102021071 its reverse (17012020110112), we get a palindrome (38113122131183).

The spelling of 21101102021071 in words is "twenty-one trillion, one hundred one billion, one hundred two million, twenty-one thousand, seventy-one".