21101112201271 has 2 divisors, whose sum is σ = 21101112201272. Its totient is φ = 21101112201270.

The previous prime is 21101112201269. The next prime is 21101112201277. The reversal of 21101112201271 is 17210221110112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101112201271 - 2¹ = 21101112201269 is a prime.

It is a super-2 number, since 2×21101112201271² (a number of 27 digits) contains 22 as substring.

Together with 21101112201269, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101112201277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550556100635 + 10550556100636.

It is an arithmetic number, because the mean of its divisors is an integer number (10550556100636).

Almost surely, 2^{21101112201271} is an apocalyptic number.

21101112201271 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101112201271 is an equidigital number, since it uses as much as digits as its factorization.

21101112201271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 22.

Adding to 21101112201271 its reverse (17210221110112), we get a palindrome (38311333311383).

The spelling of 21101112201271 in words is "twenty-one trillion, one hundred one billion, one hundred twelve million, two hundred one thousand, two hundred seventy-one".